[AZ-808] [AZ-811] Strict validation on region POST + lat/lon GET

AZ-808: FluentValidation for POST /api/satellite/request
- RegionRequestValidator: id non-empty, lat/lon/sizeMeters/zoomLevel ranges
- RequestRegionRequest: [JsonRequired] on every property, no implicit defaults
- Wired via .WithValidation<RequestRegionRequest>() in MapPost chain
- Unit + integration tests + curl probe script
- New contract: contracts/api/region-request.md v1.0.0

AZ-811: FluentValidation + envelope filter for GET /api/satellite/tiles/latlon
- GetTileByLatLonQuery: nullable record (double?/int?) so the minimal-API
  binder never short-circuits with BadHttpRequestException before filters
- GetTileByLatLonQueryValidator: Cascade(Stop) + NotNull + InclusiveBetween
  per param; missing surfaces as `\`<name>\` is required.`
- RejectUnknownQueryParamsEndpointFilter: reusable IEndpointFilter that
  rejects any query key outside the allowed set with errors[<key>] map;
  catches legacy `?Latitude=` typos and hostile probes (`?debug=1&admin=1`)
- Handler: [AsParameters] GetTileByLatLonQuery + .Value deref post-validator
- Unit (validator + filter) + integration tests + curl probe script
- New contract: contracts/api/tile-latlon.md v1.0.0

Shared hygiene
- Promote AssertErrorsContainsMention from per-test-file private helpers to
  ProblemDetailsAssertions (closes batch-1 Low-severity DRY warning)
- Sync Swagger param descriptions, README, blackbox/security/perf scripts,
  uuidv5 doc with the new lat/lon/zoom query-param names

Docs
- system-flows.md F1/F2 reference the new contracts + validation layers
- modules/api_program.md adds Api/Validators + Api/DTOs sections
- _autodev_state.md: batch 2 of 4 complete; next batch = AZ-809

All smoke tests green (mode=smoke, exit 0). AZ-808 + AZ-811 transitioned
to In Testing on Jira.

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

@@ -73,7 +73,7 @@ The service follows a layered architecture:
 ### Download Single Tile
 
 ```http
-GET /api/satellite/tiles/latlon?Latitude={lat}&Longitude={lon}&ZoomLevel={zoom}
+GET /api/satellite/tiles/latlon?lat={lat}&lon={lon}&zoom={zoom}
 ```
 
 Downloads a single tile at specified coordinates and zoom level.

SatelliteProvider.Api/DTOs/GetTileByLatLonQuery.cs

@@ -0,0 +1,26 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace SatelliteProvider.Api.DTOs;
+
+// AZ-811: query-string record for GET /api/satellite/tiles/latlon.
+// Bound via `[AsParameters]` so each property maps to one query parameter.
+// `[FromQuery(Name = "...")]` pins the wire name explicitly — case-sensitive
+// match against `?lat=&lon=&zoom=`, matching the OSM convention shared with
+// the rest of the satellite-provider API (`{z, x, y}` for inventory,
+// `{lat, lon}` for region and route DTOs).
+//
+// **Why nullable types**: minimal-API parameter binding throws
+// BadHttpRequestException for missing-required non-nullable query params
+// BEFORE endpoint filters run. That short-circuit produces a plain
+// ProblemDetails via GlobalExceptionHandler — no `errors{}` envelope, no
+// per-field key. Per AZ-811 ACs 1 & 4 every missing/unknown param must
+// surface as `errors.<paramName>` in ValidationProblemDetails. Nullable
+// types let binding always succeed, so:
+//   1. RejectUnknownQueryParamsEndpointFilter handles unknown keys
+//      (e.g. legacy `?Latitude=`, hostile `?debug=1`).
+//   2. GetTileByLatLonQueryValidator handles `null` (missing) plus range.
+// Validator guarantees non-null by the time the handler dereferences.
+public sealed record GetTileByLatLonQuery(
+    [property: FromQuery(Name = "lat")] double? Lat,
+    [property: FromQuery(Name = "lon")] double? Lon,
+    [property: FromQuery(Name = "zoom")] int? Zoom);

SatelliteProvider.Api/Program.cs

@@ -206,6 +206,10 @@ app.MapGet("/tiles/{z:int}/{x:int}/{y:int}", ServeTile)
 
 app.MapGet("/api/satellite/tiles/latlon", GetTileByLatLon)
     .RequireAuthorization()
+    .AddEndpointFilter(new RejectUnknownQueryParamsEndpointFilter(new[] { "lat", "lon", "zoom" }))
+    .WithValidation<GetTileByLatLonQuery>()
+    .Produces<DownloadTileResponse>(StatusCodes.Status200OK)
+    .ProducesProblem(StatusCodes.Status400BadRequest)
     .WithOpenApi(op => new(op) { Summary = "Get satellite tile by latitude and longitude coordinates" });
 
 app.MapGet("/api/satellite/tiles/mgrs", GetSatelliteTilesByMgrs)
@@ -239,6 +243,10 @@ app.MapPost("/api/satellite/upload", UploadUavTileBatch)
 
 app.MapPost("/api/satellite/request", RequestRegion)
     .RequireAuthorization()
+    .WithValidation<RequestRegionRequest>()
+    .Accepts<RequestRegionRequest>("application/json")
+    .Produces<RegionStatusResponse>(StatusCodes.Status200OK)
+    .ProducesProblem(StatusCodes.Status400BadRequest)
     .WithOpenApi(op => new(op)
     {
         Summary = "Request tiles for a region",
@@ -271,9 +279,11 @@ async Task<IResult> ServeTile(int z, int x, int y, HttpContext httpContext, ITil
     return Results.Bytes(tile.Bytes, tile.ContentType);
 }
 
-async Task<IResult> GetTileByLatLon([FromQuery] double Latitude, [FromQuery] double Longitude, [FromQuery] int ZoomLevel, HttpContext httpContext, ITileService tileService)
+async Task<IResult> GetTileByLatLon([AsParameters] GetTileByLatLonQuery query, HttpContext httpContext, ITileService tileService)
 {
-    var tile = await tileService.DownloadAndStoreSingleTileAsync(Latitude, Longitude, ZoomLevel, httpContext.RequestAborted);
+    // AZ-811: GetTileByLatLonQueryValidator guarantees lat/lon/zoom are non-null
+    // by the time the handler runs (CascadeMode.Stop + NotNull rules).
+    var tile = await tileService.DownloadAndStoreSingleTileAsync(query.Lat!.Value, query.Lon!.Value, query.Zoom!.Value, httpContext.RequestAborted);
 
     var response = new DownloadTileResponse
     {
@@ -341,11 +351,6 @@ async Task<IResult> UploadUavTileBatch(
 
 async Task<IResult> RequestRegion([FromBody] RequestRegionRequest request, IRegionService regionService)
 {
-    if (request.SizeMeters < 100 || request.SizeMeters > 10000)
-    {
-        return Results.BadRequest(new { error = "Size must be between 100 and 10000 meters" });
-    }
-
     var status = await regionService.RequestRegionAsync(
         request.Id,
         request.Lat,

SatelliteProvider.Api/Swagger/ParameterDescriptionFilter.cs

@@ -11,13 +11,11 @@ public class ParameterDescriptionFilter : IOperationFilter
 
         var parameterDescriptions = new Dictionary<string, string>
         {
-            ["lat"] = "Latitude coordinate where image was captured",
+            ["lat"] = "Latitude coordinate (WGS84, decimal degrees, [-90, 90])",
-            ["lon"] = "Longitude coordinate where image was captured",
+            ["lon"] = "Longitude coordinate (WGS84, decimal degrees, [-180, 180])",
+            ["zoom"] = "Slippy-map zoom level [0, 22] (higher = more detail)",
             ["mgrs"] = "MGRS coordinate string",
-            ["squareSideMeters"] = "Square side size in meters",
+            ["squareSideMeters"] = "Square side size in meters"
-            ["Latitude"] = "Latitude coordinate of the tile center",
-            ["Longitude"] = "Longitude coordinate of the tile center",
-            ["ZoomLevel"] = "Zoom level for the tile (higher values = more detail)"
         };
 
         foreach (var parameter in operation.Parameters)

SatelliteProvider.Api/Validators/GetTileByLatLonQueryValidator.cs

@@ -0,0 +1,45 @@
+using FluentValidation;
+using SatelliteProvider.Api.DTOs;
+
+namespace SatelliteProvider.Api.Validators;
+
+// AZ-811: FluentValidation rules for the query-string surface of
+// GET /api/satellite/tiles/latlon. Wired through
+// ValidationEndpointFilter<GetTileByLatLonQuery> at endpoint registration
+// time (.WithValidation<GetTileByLatLonQuery>() in Program.cs).
+//
+// Each rule maps 1:1 to a query parameter; errors[] keys are camelCase per
+// GlobalValidatorConfig (matching the wire-format param names `lat`, `lon`,
+// `zoom`). Required-field detection is `NotNull()` on the nullable-bound
+// DTO (see GetTileByLatLonQuery for why properties are nullable). Each rule
+// uses CascadeMode.Stop so a missing param surfaces ONLY as
+// "`lat` is required" — not also "`lat` must be between -90 and 90" with a
+// null value. Unknown query parameters are caught upstream by
+// RejectUnknownQueryParamsEndpointFilter.
+public sealed class GetTileByLatLonQueryValidator : AbstractValidator<GetTileByLatLonQuery>
+{
+    private const double MinLat = -90.0;
+    private const double MaxLat = 90.0;
+    private const double MinLon = -180.0;
+    private const double MaxLon = 180.0;
+    private const int MinZoom = 0;
+    private const int MaxZoom = 22;
+
+    public GetTileByLatLonQueryValidator()
+    {
+        RuleFor(q => q.Lat)
+            .Cascade(CascadeMode.Stop)
+            .NotNull().WithMessage("`lat` is required.")
+            .InclusiveBetween(MinLat, MaxLat).WithMessage($"`lat` must be between {MinLat} and {MaxLat}.");
+
+        RuleFor(q => q.Lon)
+            .Cascade(CascadeMode.Stop)
+            .NotNull().WithMessage("`lon` is required.")
+            .InclusiveBetween(MinLon, MaxLon).WithMessage($"`lon` must be between {MinLon} and {MaxLon}.");
+
+        RuleFor(q => q.Zoom)
+            .Cascade(CascadeMode.Stop)
+            .NotNull().WithMessage("`zoom` is required.")
+            .InclusiveBetween(MinZoom, MaxZoom).WithMessage($"`zoom` must be between {MinZoom} and {MaxZoom} (slippy-map range).");
+    }
+}

SatelliteProvider.Api/Validators/RegionRequestValidator.cs

@@ -0,0 +1,50 @@
+using FluentValidation;
+using SatelliteProvider.Common.DTO;
+
+namespace SatelliteProvider.Api.Validators;
+
+// AZ-808: FluentValidation rules for POST /api/satellite/request.
+// Wired through ValidationEndpointFilter<RequestRegionRequest> at endpoint
+// registration time (.WithValidation<RequestRegionRequest>() in Program.cs).
+// Failures are converted to RFC 7807 ValidationProblemDetails per
+// _docs/02_document/contracts/api/error-shape.md v1.0.0.
+//
+// Required-field detection is handled at the deserializer level via
+// [JsonRequired] on RequestRegionRequest properties plus
+// JsonSerializerOptions.UnmappedMemberHandling.Disallow (AZ-795). This
+// validator covers the post-deserialization business rules: non-zero Id,
+// lat/lon/sizeMeters/zoomLevel range constraints.
+public sealed class RegionRequestValidator : AbstractValidator<RequestRegionRequest>
+{
+    private const double MinLat = -90.0;
+    private const double MaxLat = 90.0;
+    private const double MinLon = -180.0;
+    private const double MaxLon = 180.0;
+    private const double MinSizeMeters = 100.0;
+    private const double MaxSizeMeters = 10000.0;
+    private const int MinZoom = 0;
+    private const int MaxZoom = 22;
+
+    public RegionRequestValidator()
+    {
+        RuleFor(req => req.Id)
+            .NotEmpty()
+            .WithMessage("`id` must be a non-zero GUID (the caller's idempotency key).");
+
+        RuleFor(req => req.Lat)
+            .InclusiveBetween(MinLat, MaxLat)
+            .WithMessage($"`lat` must be between {MinLat} and {MaxLat}.");
+
+        RuleFor(req => req.Lon)
+            .InclusiveBetween(MinLon, MaxLon)
+            .WithMessage($"`lon` must be between {MinLon} and {MaxLon}.");
+
+        RuleFor(req => req.SizeMeters)
+            .InclusiveBetween(MinSizeMeters, MaxSizeMeters)
+            .WithMessage($"`sizeMeters` must be between {MinSizeMeters} and {MaxSizeMeters} meters.");
+
+        RuleFor(req => req.ZoomLevel)
+            .InclusiveBetween(MinZoom, MaxZoom)
+            .WithMessage($"`zoomLevel` must be between {MinZoom} and {MaxZoom} (slippy-map range).");
+    }
+}

SatelliteProvider.Api/Validators/RejectUnknownQueryParamsEndpointFilter.cs

@@ -0,0 +1,42 @@
+namespace SatelliteProvider.Api.Validators;
+
+// AZ-811: endpoint filter that rejects any query-string parameter outside an
+// allowed-set. ASP.NET model binding silently ignores unknown query params,
+// which means typos (e.g. `?latitude=` after AZ-812's rename to `lat`) bind
+// to the default value (0.0) and may produce a misleading 200 or a confusing
+// out-of-range 400 from the value-validator. This filter catches the typo at
+// the envelope level and returns a structured RFC 7807 ValidationProblemDetails
+// with errors[<paramName>] = "Unknown query parameter ...", matching the
+// shape produced by ValidationEndpointFilter<T> + GlobalExceptionHandler.
+//
+// Apply BEFORE ValidationEndpointFilter<T> so unknown-param errors precede
+// range checks against the bound default value.
+public sealed class RejectUnknownQueryParamsEndpointFilter : IEndpointFilter
+{
+    private readonly HashSet<string> _allowedKeys;
+
+    public RejectUnknownQueryParamsEndpointFilter(IEnumerable<string> allowedKeys)
+    {
+        _allowedKeys = new HashSet<string>(allowedKeys, StringComparer.OrdinalIgnoreCase);
+    }
+
+    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+    {
+        var query = context.HttpContext.Request.Query;
+        var unknown = query.Keys.Where(k => !_allowedKeys.Contains(k)).ToList();
+
+        if (unknown.Count > 0)
+        {
+            var errors = unknown.ToDictionary(
+                k => k,
+                k => new[]
+                {
+                    $"Unknown query parameter `{k}`. Allowed: {string.Join(", ", _allowedKeys.Select(a => $"`{a}`"))}."
+                });
+
+            return Results.ValidationProblem(errors);
+        }
+
+        return await next(context);
+    }
+}

SatelliteProvider.Common/DTO/RequestRegionRequest.cs

@@ -1,26 +1,39 @@
-using System.ComponentModel.DataAnnotations;
 using System.Text.Json.Serialization;
 
 namespace SatelliteProvider.Common.DTO;
 
+// AZ-812 (cycle 8): wire-format renamed Latitude/Longitude → Lat/Lon (OSM
+// convention) and added [JsonPropertyName("lat"/"lon")] so the wire is
+// unambiguous under JsonSerializerOptions.UnmappedMemberHandling.Disallow
+// (AZ-795 cycle 7).
+//
+// AZ-808 (cycle 8): switched [Required] → [JsonRequired] on every property.
+// [Required] is DataAnnotations and is NOT enforced by System.Text.Json — the
+// 2026-05-22 black-box probe confirmed it: omitting `id` returned HTTP 200
+// with id=Guid.Empty (silent coercion). [JsonRequired] is enforced by the
+// STJ deserializer and fails with BadHttpRequestException(JsonException),
+// which the GlobalExceptionHandler converts to RFC 7807 ValidationProblemDetails.
+// Removed the in-property defaults (= 18 for ZoomLevel, = false for StitchTiles)
+// because [JsonRequired] forces the caller to declare intent.
 public record RequestRegionRequest
 {
-    [Required]
+    [JsonRequired]
     public Guid Id { get; set; }
 
-    [Required]
+    [JsonRequired]
     [JsonPropertyName("lat")]
     public double Lat { get; set; }
 
-    [Required]
+    [JsonRequired]
     [JsonPropertyName("lon")]
     public double Lon { get; set; }
 
-    [Required]
+    [JsonRequired]
     public double SizeMeters { get; set; }
 
-    [Required]
+    [JsonRequired]
-    public int ZoomLevel { get; set; } = 18;
+    public int ZoomLevel { get; set; }
 
-    public bool StitchTiles { get; set; } = false;
+    [JsonRequired]
+    public bool StitchTiles { get; set; }
 }

SatelliteProvider.IntegrationTests/GetTileByLatLonValidationTests.cs

@@ -0,0 +1,173 @@
+namespace SatelliteProvider.IntegrationTests;
+
+// AZ-811: end-to-end coverage for GET /api/satellite/tiles/latlon strict input
+// validation. Two enforcement layers:
+//   1. RejectUnknownQueryParamsEndpointFilter — rejects any query key outside
+//      {lat, lon, zoom}, catching typos like `?latitude=` that pre-AZ-811
+//      silently bound to 0.
+//   2. WithValidation<GetTileByLatLonQuery> — range-checks lat, lon, zoom.
+// Both surface RFC 7807 ValidationProblemDetails per error-shape.md v1.0.0.
+public static class GetTileByLatLonValidationTests
+{
+    private const string LatLonPath = "/api/satellite/tiles/latlon";
+
+    public static async Task RunAll(HttpClient httpClient)
+    {
+        RouteTestHelpers.PrintTestHeader("Test: GET /api/satellite/tiles/latlon strict validation (AZ-811)");
+
+        await HappyPath_Returns200(httpClient);
+
+        // Validator rules (range)
+        await LatOutOfRange_Returns400(httpClient);
+        await LonOutOfRange_Returns400(httpClient);
+        await ZoomOutOfRange_Returns400(httpClient);
+
+        // Validator rules (missing required)
+        await MissingLat_Returns400(httpClient);
+
+        // Envelope rule: unknown query params
+        await UnknownQueryParam_LegacyLatitude_Returns400(httpClient);
+        await UnknownQueryParam_Hostile_Returns400(httpClient);
+
+        // Type mismatch (delegates to GlobalExceptionHandler via model-binding)
+        await LatTypeMismatch_Returns400(httpClient);
+
+        Console.WriteLine("✓ GET lat/lon validation tests: PASSED");
+    }
+
+    private static async Task HappyPath_Returns200(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 AC-2: well-formed query → HTTP 200");
+
+        // Act
+        var response = await httpClient.GetAsync($"{LatLonPath}?lat=47.461747&lon=37.647063&zoom=18");
+        var status = (int)response.StatusCode;
+        var bodyText = await response.Content.ReadAsStringAsync();
+
+        // Assert
+        if (status != 200)
+        {
+            throw new Exception($"AZ-811 happy path: expected HTTP 200, got {status}. Body: {bodyText}");
+        }
+
+        Console.WriteLine("  ✓ {lat,lon,zoom} accepted with HTTP 200");
+    }
+
+    private static async Task LatOutOfRange_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 rule 1: lat out of range (-90..90) → HTTP 400");
+
+        // Act
+        var response = await httpClient.GetAsync($"{LatLonPath}?lat=91&lon=37.647063&zoom=18");
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-811 lat out of range");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-811 lat out of range", expectedErrorPath: "lat");
+
+        Console.WriteLine("  ✓ lat=91 rejected with errors[\"lat\"]");
+    }
+
+    private static async Task LonOutOfRange_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 rule 2: lon out of range (-180..180) → HTTP 400");
+
+        // Act
+        var response = await httpClient.GetAsync($"{LatLonPath}?lat=47.461747&lon=181&zoom=18");
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-811 lon out of range");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-811 lon out of range", expectedErrorPath: "lon");
+
+        Console.WriteLine("  ✓ lon=181 rejected with errors[\"lon\"]");
+    }
+
+    private static async Task ZoomOutOfRange_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 rule 3: zoom out of range (0..22) → HTTP 400");
+
+        // Act
+        var response = await httpClient.GetAsync($"{LatLonPath}?lat=47.461747&lon=37.647063&zoom=30");
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-811 zoom out of range");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-811 zoom out of range", expectedErrorPath: "zoom");
+
+        Console.WriteLine("  ✓ zoom=30 rejected with errors[\"zoom\"]");
+    }
+
+    private static async Task MissingLat_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 rule 1: missing `lat` query param → HTTP 400 with errors.lat");
+
+        // Act — only lon + zoom supplied; the validator's NotNull rule on Lat must
+        // fire (binder produces Lat=null because the DTO is nullable; see
+        // GetTileByLatLonQuery for why).
+        var response = await httpClient.GetAsync($"{LatLonPath}?lon=37.647063&zoom=18");
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-811 missing lat");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-811 missing lat", expectedErrorPath: "lat");
+
+        Console.WriteLine("  ✓ Missing lat rejected with errors[\"lat\"] = `lat` is required");
+    }
+
+    private static async Task UnknownQueryParam_LegacyLatitude_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 rule 4: legacy `?Latitude=&Longitude=&ZoomLevel=` (pre-AZ-811 wire format) → HTTP 400 (envelope filter)");
+
+        // Act — exact pre-AZ-811 wire format; must now fail explicitly instead
+        // of silently binding to lat=0/lon=0/zoom=0 (typo class).
+        var response = await httpClient.GetAsync($"{LatLonPath}?Latitude=47.461747&Longitude=37.647063&ZoomLevel=18");
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-811 legacy param names");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-811 legacy param names");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "Latitude", label: "AZ-811 legacy param names");
+
+        Console.WriteLine("  ✓ Legacy ?Latitude=&Longitude=&ZoomLevel= rejected by envelope filter");
+    }
+
+    private static async Task UnknownQueryParam_Hostile_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 rule 4: hostile/typo query keys → HTTP 400 (envelope filter)");
+
+        // Act
+        var response = await httpClient.GetAsync($"{LatLonPath}?lat=47.461747&lon=37.647063&zoom=18&debug=1&admin=true");
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-811 hostile params");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-811 hostile params");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "debug", label: "AZ-811 hostile params");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "admin", label: "AZ-811 hostile params");
+
+        Console.WriteLine("  ✓ ?debug=1&admin=true rejected; errors map names BOTH unknown keys");
+    }
+
+    private static async Task LatTypeMismatch_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-811 rule 5: lat type mismatch (non-numeric) → HTTP 400");
+
+        // Act
+        var response = await httpClient.GetAsync($"{LatLonPath}?lat=fifty&lon=37.647063&zoom=18");
+        var status = (int)response.StatusCode;
+
+        // Assert — ASP.NET query-param binding produces 400 for type mismatch via
+        // BadHttpRequestException; the exact ProblemDetails shape varies depending
+        // on whether the GlobalExceptionHandler intercepts. Either way the wire
+        // contract is HTTP 400, no body leak.
+        if (status != 400)
+        {
+            throw new Exception($"AZ-811 type mismatch: expected HTTP 400, got {status}.");
+        }
+
+        Console.WriteLine("  ✓ lat=fifty rejected with HTTP 400");
+    }
+}

SatelliteProvider.IntegrationTests/JwtIntegrationTests.cs

@@ -6,7 +6,7 @@ namespace SatelliteProvider.IntegrationTests;
 
 public static class JwtIntegrationTests
 {
-    private const string ProtectedTilesPath = "/api/satellite/tiles/latlon?Latitude=47.461747&Longitude=37.647063&ZoomLevel=18";
+    private const string ProtectedTilesPath = "/api/satellite/tiles/latlon?lat=47.461747&lon=37.647063&zoom=18";
     private const string ProtectedRegionPath = "/api/satellite/region/00000000-0000-0000-0000-000000000000";
 
     public static async Task RunAll(string apiUrl, string secret)

SatelliteProvider.IntegrationTests/ProblemDetailsAssertions.cs

@@ -92,6 +92,46 @@ public static class ProblemDetailsAssertions
         }
     }
 
+    // AZ-808 cycle 8: promoted from per-test-file private helpers (was
+    // duplicated in TileInventoryValidationTests + RegionFieldRenameTests +
+    // RegionRequestValidationTests) so every validation test points at one
+    // source of truth for "is this field-name or substring mentioned anywhere
+    // in the errors map?".
+    public static void AssertErrorsContainsMention(JsonElement problem, string expectedMention, string label)
+    {
+        if (!problem.TryGetProperty("errors", out var errorsEl) || errorsEl.ValueKind != JsonValueKind.Object)
+        {
+            throw new Exception($"{label}: expected 'errors' object in ProblemDetails body.");
+        }
+
+        var found = false;
+        foreach (var prop in errorsEl.EnumerateObject())
+        {
+            if (prop.Name.Contains(expectedMention, StringComparison.OrdinalIgnoreCase))
+            {
+                found = true;
+                break;
+            }
+
+            foreach (var msg in prop.Value.EnumerateArray())
+            {
+                if (msg.GetString()?.Contains(expectedMention, StringComparison.OrdinalIgnoreCase) == true)
+                {
+                    found = true;
+                    break;
+                }
+            }
+
+            if (found) break;
+        }
+
+        if (!found)
+        {
+            var paths = string.Join(", ", errorsEl.EnumerateObject().Select(p => p.Name));
+            throw new Exception($"{label}: expected '{expectedMention}' to appear in errors keys or messages. Available paths: {paths}.");
+        }
+    }
+
     private static IEnumerable<string> EnumeratePaths(JsonElement errorsEl)
     {
         foreach (var prop in errorsEl.EnumerateObject())

SatelliteProvider.IntegrationTests/Program.cs

@@ -141,6 +141,8 @@ class Program
         await TileInventoryTests.RunAll(httpClient);
         await TileInventoryValidationTests.RunAll(httpClient);
         await RegionFieldRenameTests.RunAll(httpClient);
+        await RegionRequestValidationTests.RunAll(httpClient);
+        await GetTileByLatLonValidationTests.RunAll(httpClient);
         await LeafletPathIndexOnlyTests.RunAll(connectionString);
         await MigrationTests.RunAll();
     }
@@ -166,6 +168,8 @@ class Program
         await TileInventoryTests.RunAll(httpClient);
         await TileInventoryValidationTests.RunAll(httpClient);
         await RegionFieldRenameTests.RunAll(httpClient);
+        await RegionRequestValidationTests.RunAll(httpClient);
+        await GetTileByLatLonValidationTests.RunAll(httpClient);
         await LeafletPathIndexOnlyTests.RunAll(connectionString);
         await MigrationTests.RunAll();
     }

SatelliteProvider.IntegrationTests/RegionFieldRenameTests.cs

@@ -1,6 +1,4 @@
-using System.Net.Http.Json;
 using System.Text;
-using System.Text.Json;
 
 namespace SatelliteProvider.IntegrationTests;
 
@@ -63,7 +61,7 @@ public static class RegionFieldRenameTests
 
         // Assert
         ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-812 legacy field names");
-        AssertErrorsContainsMention(problem, expectedMention: "latitude", label: "AZ-812 legacy field names");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "latitude", label: "AZ-812 legacy field names");
 
         Console.WriteLine("  ✓ Legacy {latitude,longitude} body rejected with HTTP 400; errors map names the unknown field");
     }
@@ -73,39 +71,4 @@ public static class RegionFieldRenameTests
         var content = new StringContent(body, Encoding.UTF8, "application/json");
         return httpClient.PostAsync(RegionPath, content);
     }
-
-    private static void AssertErrorsContainsMention(JsonElement problem, string expectedMention, string label)
-    {
-        if (!problem.TryGetProperty("errors", out var errorsEl) || errorsEl.ValueKind != JsonValueKind.Object)
-        {
-            throw new Exception($"{label}: expected 'errors' object in ProblemDetails body.");
-        }
-
-        var found = false;
-        foreach (var prop in errorsEl.EnumerateObject())
-        {
-            if (prop.Name.Contains(expectedMention, StringComparison.OrdinalIgnoreCase))
-            {
-                found = true;
-                break;
-            }
-
-            foreach (var msg in prop.Value.EnumerateArray())
-            {
-                if (msg.GetString()?.Contains(expectedMention, StringComparison.OrdinalIgnoreCase) == true)
-                {
-                    found = true;
-                    break;
-                }
-            }
-
-            if (found) break;
-        }
-
-        if (!found)
-        {
-            var paths = string.Join(", ", errorsEl.EnumerateObject().Select(p => p.Name));
-            throw new Exception($"{label}: expected '{expectedMention}' to appear in errors keys or messages. Available paths: {paths}.");
-        }
-    }
 }

SatelliteProvider.IntegrationTests/RegionRequestValidationTests.cs

@@ -0,0 +1,340 @@
+using System.Text;
+using System.Text.Json;
+
+namespace SatelliteProvider.IntegrationTests;
+
+// AZ-808: end-to-end coverage for the region-request endpoint's strict input
+// validation. Each test exercises one rule from the validator (FluentValidation
+// for business rules, JsonSerializerOptions for wire-format rules) and asserts
+// the response body conforms to the RFC 7807 ValidationProblemDetails contract
+// in `_docs/02_document/contracts/api/error-shape.md` v1.0.0.
+//
+// Field names use the post-AZ-812 OSM convention (`lat`/`lon`). The legacy
+// `latitude`/`longitude` wire format is verified to be rejected by
+// RegionFieldRenameTests.cs (AZ-812 AC-4).
+public static class RegionRequestValidationTests
+{
+    private const string RegionPath = "/api/satellite/request";
+
+    public static async Task RunAll(HttpClient httpClient)
+    {
+        RouteTestHelpers.PrintTestHeader("Test: Region endpoint strict validation (AZ-808)");
+
+        await HappyPath_Returns200(httpClient);
+
+        // Rule 1: body present
+        await EmptyBody_Returns400(httpClient);
+
+        // Rule 2: id required, non-zero Guid
+        await MissingId_Returns400(httpClient);
+        await ZeroGuidId_Returns400(httpClient);
+
+        // Rule 3: lat required, [-90, 90]
+        await MissingLat_Returns400(httpClient);
+        await LatOutOfRange_Returns400(httpClient);
+
+        // Rule 4: lon required, [-180, 180]
+        await MissingLon_Returns400(httpClient);
+        await LonOutOfRange_Returns400(httpClient);
+
+        // Rule 5: sizeMeters required, [100, 10000]
+        await MissingSizeMeters_Returns400(httpClient);
+        await SizeMetersOutOfRange_Returns400(httpClient);
+
+        // Rule 6: zoomLevel required, [0, 22]
+        await MissingZoomLevel_Returns400(httpClient);
+        await ZoomLevelOutOfRange_Returns400(httpClient);
+
+        // Rule 7: stitchTiles required (bool, no default)
+        await MissingStitchTiles_Returns400(httpClient);
+
+        // Rule 9: type mismatch
+        await LatTypeMismatch_Returns400(httpClient);
+
+        // Rule 8 (unknown root fields) is covered by RegionFieldRenameTests (AZ-812 AC-4).
+
+        Console.WriteLine("✓ Region-request validation tests: PASSED");
+    }
+
+    private static async Task HappyPath_Returns200(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 AC-2: well-formed request → HTTP 200");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var status = (int)response.StatusCode;
+        var bodyText = await response.Content.ReadAsStringAsync();
+
+        // Assert
+        if (status != 200)
+        {
+            throw new Exception($"AZ-808 AC-2 happy path: expected HTTP 200, got {status}. Body: {bodyText}");
+        }
+
+        Console.WriteLine("  ✓ Well-formed body accepted with HTTP 200");
+    }
+
+    private static async Task EmptyBody_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 1: empty body → HTTP 400");
+
+        // Arrange
+        const string body = "";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var status = (int)response.StatusCode;
+
+        // Assert
+        if (status != 400)
+        {
+            throw new Exception($"AZ-808 rule 1: expected HTTP 400, got {status}.");
+        }
+
+        Console.WriteLine("  ✓ Empty body rejected with HTTP 400");
+    }
+
+    private static async Task MissingId_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 2 (probe-confirmed gap): missing `id` → HTTP 400 (no silent zero-Guid coercion)");
+
+        // Arrange — the exact 2026-05-22 probe payload that silently coerced to Guid.Empty pre-AZ-808.
+        const string body = "{\"lat\":49.94,\"lon\":36.31,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 missing id");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 missing id");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "id", label: "AZ-808 missing id");
+
+        Console.WriteLine("  ✓ Missing `id` rejected with HTTP 400 (no silent coercion)");
+    }
+
+    private static async Task ZeroGuidId_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 2: zero-Guid `id` → HTTP 400");
+
+        // Arrange
+        const string body = "{\"id\":\"00000000-0000-0000-0000-000000000000\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 zero-Guid id");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 zero-Guid id", expectedErrorPath: "id");
+
+        Console.WriteLine("  ✓ Zero-Guid `id` rejected with errors[\"id\"]");
+    }
+
+    private static async Task MissingLat_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 3: missing `lat` → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 missing lat");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 missing lat");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "lat", label: "AZ-808 missing lat");
+
+        Console.WriteLine("  ✓ Missing `lat` rejected with HTTP 400");
+    }
+
+    private static async Task LatOutOfRange_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 3: `lat` out of range (-90..90) → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":91.0,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 lat out of range");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 lat out of range", expectedErrorPath: "lat");
+
+        Console.WriteLine("  ✓ `lat=91.0` rejected with errors[\"lat\"]");
+    }
+
+    private static async Task MissingLon_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 4: missing `lon` → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 missing lon");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 missing lon");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "lon", label: "AZ-808 missing lon");
+
+        Console.WriteLine("  ✓ Missing `lon` rejected with HTTP 400");
+    }
+
+    private static async Task LonOutOfRange_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 4: `lon` out of range (-180..180) → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"lon\":181.0,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 lon out of range");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 lon out of range", expectedErrorPath: "lon");
+
+        Console.WriteLine("  ✓ `lon=181.0` rejected with errors[\"lon\"]");
+    }
+
+    private static async Task MissingSizeMeters_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 5: missing `sizeMeters` → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"lon\":37.647063,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 missing sizeMeters");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 missing sizeMeters");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "sizeMeters", label: "AZ-808 missing sizeMeters");
+
+        Console.WriteLine("  ✓ Missing `sizeMeters` rejected with HTTP 400");
+    }
+
+    private static async Task SizeMetersOutOfRange_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 5: `sizeMeters` out of range (100..10000) → HTTP 400");
+
+        // Arrange — same 1M cap-exceeder used by SEC-03; this validator replaces the old inline check.
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":1000000,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 sizeMeters out of range");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 sizeMeters out of range", expectedErrorPath: "sizeMeters");
+
+        Console.WriteLine("  ✓ `sizeMeters=1000000` rejected with errors[\"sizeMeters\"]");
+    }
+
+    private static async Task MissingZoomLevel_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 6: missing `zoomLevel` → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 missing zoomLevel");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 missing zoomLevel");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "zoomLevel", label: "AZ-808 missing zoomLevel");
+
+        Console.WriteLine("  ✓ Missing `zoomLevel` rejected with HTTP 400");
+    }
+
+    private static async Task ZoomLevelOutOfRange_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 6: `zoomLevel` out of range (0..22) → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":30,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 zoomLevel out of range");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 zoomLevel out of range", expectedErrorPath: "zoomLevel");
+
+        Console.WriteLine("  ✓ `zoomLevel=30` rejected with errors[\"zoomLevel\"]");
+    }
+
+    private static async Task MissingStitchTiles_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 7: missing `stitchTiles` → HTTP 400 (no defaulting to false)");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 missing stitchTiles");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 missing stitchTiles");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "stitchTiles", label: "AZ-808 missing stitchTiles");
+
+        Console.WriteLine("  ✓ Missing `stitchTiles` rejected with HTTP 400");
+    }
+
+    private static async Task LatTypeMismatch_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-808 rule 9: type mismatch (`lat` as string) → HTTP 400");
+
+        // Arrange
+        var regionId = Guid.NewGuid();
+        var body = $"{{\"id\":\"{regionId}\",\"lat\":\"fifty\",\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}}";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-808 lat type mismatch");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-808 lat type mismatch");
+
+        Console.WriteLine("  ✓ `lat:\"fifty\"` rejected with HTTP 400");
+    }
+
+    private static Task<HttpResponseMessage> PostJsonAsync(HttpClient httpClient, string body)
+    {
+        var content = new StringContent(body, Encoding.UTF8, "application/json");
+        return httpClient.PostAsync(RegionPath, content);
+    }
+}

SatelliteProvider.IntegrationTests/SecurityTests.cs

@@ -23,7 +23,7 @@ public static class SecurityTests
         Console.WriteLine("SEC-01: SQL injection attempt in coordinate query string");
 
         var injection = "' OR 1=1 --";
-        var url = $"/api/satellite/tiles/latlon?Latitude={Uri.EscapeDataString(injection)}&Longitude=37.647063&ZoomLevel=18";
+        var url = $"/api/satellite/tiles/latlon?lat={Uri.EscapeDataString(injection)}&lon=37.647063&zoom=18";
         var response = await httpClient.GetAsync(url);
 
         if (response.StatusCode != HttpStatusCode.BadRequest && response.StatusCode != HttpStatusCode.UnprocessableEntity)

SatelliteProvider.IntegrationTests/TileInventoryValidationTests.cs

@@ -199,7 +199,7 @@ public static class TileInventoryValidationTests
 
         // Assert
         ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 missing z");
-        AssertErrorsContainsMention(problem, expectedMention: "z", label: "AZ-796 missing z");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "z", label: "AZ-796 missing z");
 
         Console.WriteLine("  ✓ Missing `z` rejected with errors map mentioning the field");
     }
@@ -325,7 +325,7 @@ public static class TileInventoryValidationTests
 
         // Assert
         ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 unknown root field");
-        AssertErrorsContainsMention(problem, expectedMention: "unknownField", label: "AZ-796 unknown root field");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "unknownField", label: "AZ-796 unknown root field");
 
         Console.WriteLine("  ✓ Unknown root field rejected; errors map names the field");
     }
@@ -344,7 +344,7 @@ public static class TileInventoryValidationTests
 
         // Assert
         ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 unknown nested field");
-        AssertErrorsContainsMention(problem, expectedMention: "foo", label: "AZ-796 unknown nested field");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "foo", label: "AZ-796 unknown nested field");
 
         Console.WriteLine("  ✓ Unknown nested field rejected; errors map names the field");
     }
@@ -364,7 +364,7 @@ public static class TileInventoryValidationTests
 
         // Assert
         ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-794 legacy field");
-        AssertErrorsContainsMention(problem, expectedMention: "tileZoom", label: "AZ-794 legacy field");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "tileZoom", label: "AZ-794 legacy field");
 
         Console.WriteLine("  ✓ Legacy v1.x field names rejected with explicit error (no silent coercion)");
     }
@@ -392,39 +392,4 @@ public static class TileInventoryValidationTests
         var content = new StringContent(body, Encoding.UTF8, "application/json");
         return httpClient.PostAsync(InventoryPath, content);
     }
-
-    private static void AssertErrorsContainsMention(JsonElement problem, string expectedMention, string label)
-    {
-        if (!problem.TryGetProperty("errors", out var errorsEl) || errorsEl.ValueKind != JsonValueKind.Object)
-        {
-            throw new Exception($"{label}: expected 'errors' object in ProblemDetails body.");
-        }
-
-        var found = false;
-        foreach (var prop in errorsEl.EnumerateObject())
-        {
-            if (prop.Name.Contains(expectedMention, StringComparison.OrdinalIgnoreCase))
-            {
-                found = true;
-                break;
-            }
-
-            foreach (var msg in prop.Value.EnumerateArray())
-            {
-                if (msg.GetString()?.Contains(expectedMention, StringComparison.OrdinalIgnoreCase) == true)
-                {
-                    found = true;
-                    break;
-                }
-            }
-
-            if (found) break;
-        }
-
-        if (!found)
-        {
-            var paths = string.Join(", ", errorsEl.EnumerateObject().Select(p => p.Name));
-            throw new Exception($"{label}: expected '{expectedMention}' to appear in errors keys or messages. Available paths: {paths}.");
-        }
-    }
 }

SatelliteProvider.IntegrationTests/TileTests.cs

@@ -21,7 +21,7 @@ public static class TileTests
 
         Console.WriteLine($"Getting tile at coordinates ({latitude}, {longitude}) with zoom level {zoomLevel}");
 
-        var response = await httpClient.GetAsync($"/api/satellite/tiles/latlon?Latitude={latitude}&Longitude={longitude}&ZoomLevel={zoomLevel}");
+        var response = await httpClient.GetAsync($"/api/satellite/tiles/latlon?lat={latitude}&lon={longitude}&zoom={zoomLevel}");
 
         if (!response.IsSuccessStatusCode)
         {
@@ -74,7 +74,7 @@ public static class TileTests
         Console.WriteLine();
         Console.WriteLine("Testing tile reuse (getting same tile again)...");
 
-        var response2 = await httpClient.GetAsync($"/api/satellite/tiles/latlon?Latitude={latitude}&Longitude={longitude}&ZoomLevel={zoomLevel}");
+        var response2 = await httpClient.GetAsync($"/api/satellite/tiles/latlon?lat={latitude}&lon={longitude}&zoom={zoomLevel}");
 
         if (!response2.IsSuccessStatusCode)
         {

SatelliteProvider.Tests/Validators/GetTileByLatLonQueryValidatorTests.cs

@@ -0,0 +1,159 @@
+using FluentValidation.TestHelper;
+using SatelliteProvider.Api.DTOs;
+using SatelliteProvider.Api.Validators;
+
+namespace SatelliteProvider.Tests.Validators;
+
+// AZ-811: unit tests for GetTileByLatLonQueryValidator. One Theory per RuleFor
+// covering boundary + out-of-range. Unknown-query-param rejection is tested
+// at the integration layer (GetTileByLatLonValidationTests) — there's no
+// pure-unit equivalent because the filter runs against HttpContext.Request.Query.
+public class GetTileByLatLonQueryValidatorTests
+{
+    private readonly GetTileByLatLonQueryValidator _validator;
+
+    public GetTileByLatLonQueryValidatorTests()
+    {
+        GlobalValidatorConfig.ApplyOnce();
+        _validator = new GetTileByLatLonQueryValidator();
+    }
+
+    [Theory]
+    [InlineData(-90.001)]
+    [InlineData(90.001)]
+    [InlineData(180.0)]
+    public void Validate_LatOutOfRange_FailsRangeRule(double lat)
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(lat, 37.647063, 18);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("lat");
+    }
+
+    [Fact]
+    public void Validate_LatNull_FailsNotNullRule()
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(null, 37.647063, 18);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert — CascadeMode.Stop ensures NotNull short-circuits the range
+        // rule, so the caller sees only `"\`lat\` is required."` not also the
+        // range error against a null sentinel.
+        result.ShouldHaveValidationErrorFor("lat").WithErrorMessage("`lat` is required.");
+    }
+
+    [Theory]
+    [InlineData(-90.0)]
+    [InlineData(0.0)]
+    [InlineData(47.461747)]
+    [InlineData(90.0)]
+    public void Validate_LatAtOrInsideBounds_Passes(double lat)
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(lat, 37.647063, 18);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("lat");
+    }
+
+    [Theory]
+    [InlineData(-180.001)]
+    [InlineData(180.001)]
+    [InlineData(360.0)]
+    public void Validate_LonOutOfRange_FailsRangeRule(double lon)
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(47.461747, lon, 18);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("lon");
+    }
+
+    [Fact]
+    public void Validate_LonNull_FailsNotNullRule()
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(47.461747, null, 18);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("lon").WithErrorMessage("`lon` is required.");
+    }
+
+    [Theory]
+    [InlineData(-180.0)]
+    [InlineData(0.0)]
+    [InlineData(37.647063)]
+    [InlineData(180.0)]
+    public void Validate_LonAtOrInsideBounds_Passes(double lon)
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(47.461747, lon, 18);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("lon");
+    }
+
+    [Theory]
+    [InlineData(-1)]
+    [InlineData(23)]
+    [InlineData(100)]
+    public void Validate_ZoomOutOfRange_FailsRangeRule(int zoom)
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(47.461747, 37.647063, zoom);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("zoom");
+    }
+
+    [Fact]
+    public void Validate_ZoomNull_FailsNotNullRule()
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(47.461747, 37.647063, null);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("zoom").WithErrorMessage("`zoom` is required.");
+    }
+
+    [Theory]
+    [InlineData(0)]
+    [InlineData(18)]
+    [InlineData(22)]
+    public void Validate_ZoomAtOrInsideBounds_Passes(int zoom)
+    {
+        // Arrange
+        var query = new GetTileByLatLonQuery(47.461747, 37.647063, zoom);
+
+        // Act
+        var result = _validator.TestValidate(query);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("zoom");
+    }
+}

SatelliteProvider.Tests/Validators/RegionRequestValidatorTests.cs

@@ -0,0 +1,192 @@
+using FluentValidation.TestHelper;
+using SatelliteProvider.Api.Validators;
+using SatelliteProvider.Common.DTO;
+
+namespace SatelliteProvider.Tests.Validators;
+
+// AZ-808: unit tests for RegionRequestValidator. Each RuleFor in the validator
+// has at least one passing case + one failing case. Required-field detection
+// (id / lat / lon / sizeMeters / zoomLevel / stitchTiles) is not unit-tested
+// here because it lives at the deserializer layer (JsonRequired), not the
+// validator — covered by the integration tests (RegionRequestValidationTests).
+public class RegionRequestValidatorTests
+{
+    private readonly RegionRequestValidator _validator;
+
+    public RegionRequestValidatorTests()
+    {
+        GlobalValidatorConfig.ApplyOnce();
+        _validator = new RegionRequestValidator();
+    }
+
+    private static RequestRegionRequest ValidRequest() => new()
+    {
+        Id = Guid.NewGuid(),
+        Lat = 47.461747,
+        Lon = 37.647063,
+        SizeMeters = 200.0,
+        ZoomLevel = 18,
+        StitchTiles = false,
+    };
+
+    [Fact]
+    public void Validate_AllValid_Passes()
+    {
+        // Arrange
+        var request = ValidRequest();
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+
+    [Fact]
+    public void Validate_IdEmpty_FailsNotEmptyRule()
+    {
+        // Arrange
+        var request = ValidRequest() with { Id = Guid.Empty };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("id")
+            .WithErrorMessage("`id` must be a non-zero GUID (the caller's idempotency key).");
+    }
+
+    [Theory]
+    [InlineData(-90.001)]
+    [InlineData(90.001)]
+    [InlineData(180.0)]
+    [InlineData(-181.0)]
+    public void Validate_LatOutOfRange_FailsRangeRule(double lat)
+    {
+        // Arrange
+        var request = ValidRequest() with { Lat = lat };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("lat");
+    }
+
+    [Theory]
+    [InlineData(-90.0)]
+    [InlineData(0.0)]
+    [InlineData(47.461747)]
+    [InlineData(90.0)]
+    public void Validate_LatAtOrInsideBounds_Passes(double lat)
+    {
+        // Arrange
+        var request = ValidRequest() with { Lat = lat };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("lat");
+    }
+
+    [Theory]
+    [InlineData(-180.001)]
+    [InlineData(180.001)]
+    [InlineData(360.0)]
+    public void Validate_LonOutOfRange_FailsRangeRule(double lon)
+    {
+        // Arrange
+        var request = ValidRequest() with { Lon = lon };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("lon");
+    }
+
+    [Theory]
+    [InlineData(-180.0)]
+    [InlineData(0.0)]
+    [InlineData(37.647063)]
+    [InlineData(180.0)]
+    public void Validate_LonAtOrInsideBounds_Passes(double lon)
+    {
+        // Arrange
+        var request = ValidRequest() with { Lon = lon };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("lon");
+    }
+
+    [Theory]
+    [InlineData(99.999)]
+    [InlineData(0.0)]
+    [InlineData(10000.001)]
+    [InlineData(100000.0)]
+    [InlineData(-1.0)]
+    public void Validate_SizeMetersOutOfRange_FailsRangeRule(double sizeMeters)
+    {
+        // Arrange
+        var request = ValidRequest() with { SizeMeters = sizeMeters };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("sizeMeters");
+    }
+
+    [Theory]
+    [InlineData(100.0)]
+    [InlineData(200.0)]
+    [InlineData(5000.0)]
+    [InlineData(10000.0)]
+    public void Validate_SizeMetersAtOrInsideBounds_Passes(double sizeMeters)
+    {
+        // Arrange
+        var request = ValidRequest() with { SizeMeters = sizeMeters };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("sizeMeters");
+    }
+
+    [Theory]
+    [InlineData(-1)]
+    [InlineData(23)]
+    [InlineData(100)]
+    public void Validate_ZoomLevelOutOfRange_FailsRangeRule(int zoomLevel)
+    {
+        // Arrange
+        var request = ValidRequest() with { ZoomLevel = zoomLevel };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("zoomLevel");
+    }
+
+    [Theory]
+    [InlineData(0)]
+    [InlineData(18)]
+    [InlineData(22)]
+    public void Validate_ZoomLevelAtOrInsideBounds_Passes(int zoomLevel)
+    {
+        // Arrange
+        var request = ValidRequest() with { ZoomLevel = zoomLevel };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("zoomLevel");
+    }
+}

SatelliteProvider.Tests/Validators/RejectUnknownQueryParamsEndpointFilterTests.cs

@@ -0,0 +1,124 @@
+using FluentAssertions;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.Extensions.Primitives;
+using SatelliteProvider.Api.Validators;
+
+namespace SatelliteProvider.Tests.Validators;
+
+// AZ-811: unit coverage for the envelope filter that runs ahead of the
+// FluentValidation layer on query-string endpoints. Spec section 5 calls for
+// ≥ 1 unit test on this filter; integration coverage is in
+// SatelliteProvider.IntegrationTests/GetTileByLatLonValidationTests.cs.
+public class RejectUnknownQueryParamsEndpointFilterTests
+{
+    private static readonly string[] AllowedKeys = ["lat", "lon", "zoom"];
+
+    [Fact]
+    public async Task Invoke_AllKeysAllowed_DelegatesToNext()
+    {
+        // Arrange
+        var filter = new RejectUnknownQueryParamsEndpointFilter(AllowedKeys);
+        var ctx = BuildContext(new Dictionary<string, StringValues>
+        {
+            ["lat"] = "47.461747",
+            ["lon"] = "37.647063",
+            ["zoom"] = "18"
+        });
+        var sentinel = new object();
+        EndpointFilterDelegate next = _ => ValueTask.FromResult<object?>(sentinel);
+
+        // Act
+        var result = await filter.InvokeAsync(ctx, next);
+
+        // Assert
+        result.Should().BeSameAs(sentinel, "the filter must pass through when all query keys are in the allowed set");
+    }
+
+    [Fact]
+    public async Task Invoke_UnknownKey_ReturnsValidationProblemAndDoesNotDelegate()
+    {
+        // Arrange
+        var filter = new RejectUnknownQueryParamsEndpointFilter(AllowedKeys);
+        var ctx = BuildContext(new Dictionary<string, StringValues>
+        {
+            ["lat"] = "47.461747",
+            ["lon"] = "37.647063",
+            ["zoom"] = "18",
+            ["debug"] = "1"
+        });
+        var nextCalled = false;
+        EndpointFilterDelegate next = _ =>
+        {
+            nextCalled = true;
+            return ValueTask.FromResult<object?>(new object());
+        };
+
+        // Act
+        var result = await filter.InvokeAsync(ctx, next);
+
+        // Assert
+        nextCalled.Should().BeFalse("an unknown key must short-circuit the pipeline before the handler runs");
+        var problem = result.Should().BeOfType<ProblemHttpResult>().Subject;
+        problem.StatusCode.Should().Be(StatusCodes.Status400BadRequest);
+        problem.ProblemDetails.Should().BeOfType<HttpValidationProblemDetails>();
+        var validation = (HttpValidationProblemDetails)problem.ProblemDetails;
+        validation.Errors.Should().ContainKey("debug");
+        validation.Errors["debug"][0].Should().Contain("Unknown query parameter");
+    }
+
+    [Fact]
+    public async Task Invoke_LegacyPascalCaseKeys_ReturnsErrorsPerKey()
+    {
+        // Arrange — AZ-811 envelope must catch the exact pre-rename wire format
+        // (`Latitude/Longitude/ZoomLevel`) because case-insensitive lookup against
+        // the allowed set still treats those keys as distinct from `lat/lon/zoom`.
+        var filter = new RejectUnknownQueryParamsEndpointFilter(AllowedKeys);
+        var ctx = BuildContext(new Dictionary<string, StringValues>
+        {
+            ["Latitude"] = "47.461747",
+            ["Longitude"] = "37.647063",
+            ["ZoomLevel"] = "18"
+        });
+        EndpointFilterDelegate next = _ => ValueTask.FromResult<object?>(new object());
+
+        // Act
+        var result = await filter.InvokeAsync(ctx, next);
+
+        // Assert
+        var problem = result.Should().BeOfType<ProblemHttpResult>().Subject;
+        var validation = (HttpValidationProblemDetails)problem.ProblemDetails;
+        validation.Errors.Should().ContainKey("Latitude");
+        validation.Errors.Should().ContainKey("Longitude");
+        validation.Errors.Should().ContainKey("ZoomLevel");
+    }
+
+    [Fact]
+    public async Task Invoke_KeysAreCaseInsensitiveAgainstAllowedSet()
+    {
+        // Arrange — `Lat` (capital L) is the SAME allowed key as `lat`
+        // (`StringComparer.OrdinalIgnoreCase`). It must pass through.
+        var filter = new RejectUnknownQueryParamsEndpointFilter(AllowedKeys);
+        var ctx = BuildContext(new Dictionary<string, StringValues>
+        {
+            ["Lat"] = "47.461747",
+            ["lon"] = "37.647063",
+            ["ZOOM"] = "18"
+        });
+        var sentinel = new object();
+        EndpointFilterDelegate next = _ => ValueTask.FromResult<object?>(sentinel);
+
+        // Act
+        var result = await filter.InvokeAsync(ctx, next);
+
+        // Assert
+        result.Should().BeSameAs(sentinel);
+    }
+
+    private static EndpointFilterInvocationContext BuildContext(IDictionary<string, StringValues> queryParams)
+    {
+        var httpContext = new DefaultHttpContext();
+        httpContext.Request.Query = new QueryCollection(queryParams.ToDictionary(kv => kv.Key, kv => kv.Value));
+        return new DefaultEndpointFilterInvocationContext(httpContext);
+    }
+}

_docs/02_document/contracts/api/region-request.md

@@ -0,0 +1,172 @@
+# Contract: region-request
+
+**Component**: WebApi (`SatelliteProvider.Api`) producing rows via RegionProcessing (`SatelliteProvider.Services.RegionProcessing`)
+**Producer task**: AZ-808 — `_docs/02_tasks/done/AZ-808_region_endpoint_validation.md` (validator + this contract); AZ-812 — `_docs/02_tasks/done/AZ-812_region_field_rename_to_osm.md` (OSM-convention wire-format `lat`/`lon`)
+**Consumer tasks**: `gps-denied-onboard` AZ-777 Phase 2 (seeds Derkachi reference tile catalog via this endpoint)
+**Version**: 1.0.0
+**Status**: frozen
+**Last Updated**: 2026-05-22
+
+## Purpose
+
+Defines the HTTP contract for `POST /api/satellite/request` — the region-onboarding endpoint that enqueues a square region of tiles for asynchronous backfill from Google Maps. Callers submit a `(lat, lon, sizeMeters, zoomLevel)` envelope identified by a client-provided `id` (idempotency key); the API responds immediately with the queued region's status. Actual tile downloads run in the background via `RegionProcessingService` (`system-flows.md` Flow F2). Callers poll `GET /api/satellite/region/{id}` until `status == completed`.
+
+This is the v1.0.0 of the contract — published alongside AZ-808's validator landing. There is no prior contract document. AZ-812 had already renamed the wire-format fields `Latitude/Longitude` → `lat/lon` (OSM convention) earlier in cycle 8; this contract publishes the post-rename shape directly with no transitional period.
+
+## Endpoint
+
+```
+POST /api/satellite/request
+Content-Type: application/json
+Authorization: Bearer <JWT>
+```
+
+The request MUST carry a valid JWT (AZ-487). No `permissions` claim is required. Anonymous requests are rejected with HTTP 401.
+
+## Shape
+
+### Request body
+
+```jsonc
+{
+  "id": "8f5e6d3e-1a2b-4c3d-9e8f-0123456789ab",
+  "lat": 47.461747,
+  "lon": 37.647063,
+  "sizeMeters": 200,
+  "zoomLevel": 18,
+  "stitchTiles": false
+}
+```
+
+Per-field constraints:
+
+| Field | Type | Required | Description | Constraints |
+|-------|------|----------|-------------|-------------|
+| `id` | UUID | yes | Client-provided idempotency key. POSTing the same `id` twice returns the existing region (idempotent per AZ-362). | Non-zero GUID. `00000000-...` → HTTP 400. |
+| `lat` | number | yes | Region centre latitude (WGS84, decimal degrees). | `[-90.0, 90.0]`. |
+| `lon` | number | yes | Region centre longitude (WGS84, decimal degrees). | `[-180.0, 180.0]`. |
+| `sizeMeters` | number | yes | Square region side length. | `[100.0, 10000.0]`. Anything larger → HTTP 400. |
+| `zoomLevel` | integer | yes | Slippy-map zoom level for the resulting tiles. | `[0, 22]`. |
+| `stitchTiles` | bool | yes | If true, a stitched composite image is produced once all tiles are present. No default — caller MUST declare intent. | true / false. |
+
+Strict parsing: unknown fields at root are rejected with HTTP 400 by `JsonSerializerOptions.UnmappedMemberHandling.Disallow` (AZ-795). Missing required fields are caught by `[JsonRequired]` on the DTO and surface as HTTP 400 with the field name in `errors`.
+
+### Response body
+
+```jsonc
+{
+  "id": "8f5e6d3e-1a2b-4c3d-9e8f-0123456789ab",
+  "status": "queued",
+  "csvFilePath": null,
+  "summaryFilePath": null,
+  "tilesDownloaded": 0,
+  "tilesReused": 0,
+  "createdAt": "2026-05-22T12:34:56.789Z",
+  "updatedAt": "2026-05-22T12:34:56.789Z"
+}
+```
+
+Per-field semantics:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `id` | UUID | Echo of the request `id`. |
+| `status` | string enum | `"queued"` immediately after enqueue; transitions through `"processing"` → `"completed"` (or `"failed"`) on the background worker. |
+| `csvFilePath` | string \| null | Path to the per-region tile-manifest CSV. Null until processing produces it. |
+| `summaryFilePath` | string \| null | Path to the human-readable summary. Null until processing produces it. |
+| `tilesDownloaded` | integer | Count of tiles fetched fresh from Google Maps. Updated as processing progresses. |
+| `tilesReused` | integer | Count of tiles served from existing cache. Updated as processing progresses. |
+| `createdAt` | ISO-8601 UTC | Initial enqueue timestamp. Stable across retries (per AZ-362 idempotency). |
+| `updatedAt` | ISO-8601 UTC | Last status-row write. Bumps as the background worker progresses. |
+
+### Endpoint summary
+
+| Method | Path | Request body | Response | Status codes |
+|--------|------|--------------|----------|--------------|
+| `POST` | `/api/satellite/request` | `RequestRegionRequest` | `RegionStatusResponse` | 200, 400, 401 |
+
+## Error shape
+
+All `400` responses conform to `_docs/02_document/contracts/api/error-shape.md` v1.0.0. Two enforcement layers produce identically-shaped bodies:
+
+1. **JSON deserializer rules** — wire-format failures: unknown fields (`UnmappedMemberHandling.Disallow`), missing `[JsonRequired]` properties, type mismatches. Surface via `BadHttpRequestException(JsonException)` → `GlobalExceptionHandler`.
+2. **`RegionRequestValidator`** (FluentValidation, AZ-808) — business rules: non-zero `id`, range checks for `lat` / `lon` / `sizeMeters` / `zoomLevel`. Surface via `ValidationEndpointFilter<RequestRegionRequest>`.
+
+Example body for a missing-id failure (the pre-AZ-808 silent-coercion gap surfaced by the 2026-05-22 black-box probe):
+
+```jsonc
+{
+  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+  "title": "One or more validation errors occurred.",
+  "status": 400,
+  "errors": {
+    "id": ["The id field is required."]
+  }
+}
+```
+
+Example body for a zero-Guid id (validator-level rejection):
+
+```jsonc
+{
+  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+  "title": "One or more validation errors occurred.",
+  "status": 400,
+  "errors": {
+    "id": ["`id` must be a non-zero GUID (the caller's idempotency key)."]
+  }
+}
+```
+
+## Invariants
+
+- **Inv-1**: `id` MUST be a non-zero GUID. Pre-AZ-808, omitting `id` silently coerced to `Guid.Empty` and queued a region under the zero key; AZ-808 fails this with HTTP 400 and `errors["id"]`.
+- **Inv-2**: `lat ∈ [-90.0, 90.0]`. Out-of-range → 400 with `errors["lat"]`.
+- **Inv-3**: `lon ∈ [-180.0, 180.0]`. Out-of-range → 400 with `errors["lon"]`.
+- **Inv-4**: `sizeMeters ∈ [100.0, 10000.0]`. Out-of-range → 400 with `errors["sizeMeters"]`. Pre-AZ-808 this rule lived as an inline `if` in the handler; AZ-808 moves it into the validator.
+- **Inv-5**: `zoomLevel ∈ [0, 22]` (slippy-map zoom range, matching `tile-inventory.md` Inv-8).
+- **Inv-6**: `stitchTiles` MUST be explicitly provided. No defaulting to `false` — callers declare intent.
+- **Inv-7**: Unknown fields at root are rejected with HTTP 400 + the field name in `errors`.
+- **Inv-8** (idempotency, AZ-362): Two POSTs with the same `id` return the existing region resource with HTTP 200 and do NOT enqueue duplicate background processing. The post-rename `lat`/`lon` wire format does not affect this invariant.
+- **Inv-9** (async semantics): The endpoint returns immediately after enqueuing. Status transitions to `completed`/`failed` happen on the background `RegionProcessingService`. Callers MUST poll `GET /api/satellite/region/{id}` to observe completion.
+
+## Non-Goals
+
+- **Not covered**: tile body fetch. The background worker writes tiles into the `tiles` table; callers fetch bodies via `GET /tiles/{z}/{x}/{y}` after polling shows `status == completed`.
+- **Not covered**: backward-compatibility shim for `Latitude/Longitude` wire field names. AZ-812 ships v1.0.0 of this contract directly with the post-rename names; pre-rename callers receive HTTP 400 with `errors["latitude"]: ["could not be mapped"]`. There is no transitional accept-both period.
+- **Not covered**: geofencing semantics. Geofences are a Route concern, not a Region concern; documented in `route-create.md` (forthcoming, AZ-809).
+- **Not covered**: cancellation of a queued region. The current API has no DELETE / cancel verb. Tracked separately if needed.
+
+## Versioning Rules
+
+- **Patch (1.0.x)**: Documentation clarifications, additional invariants that do not change wire behaviour.
+- **Minor (1.x.0)**: Adding an optional response field consumers may safely ignore (e.g. ETA estimate); relaxing a range constraint within `[-90,90]` / `[-180,180]` envelope (e.g. accepting decimal degrees with extra precision).
+- **Major (2.0.0)**: Changing a field name; tightening a range constraint (breaks today's valid callers); making `stitchTiles` optional with a default again; removing idempotency.
+
+## Test Cases
+
+| Case | Input | Expected | Notes |
+|------|-------|----------|-------|
+| happy-path | `{id:<guid>, lat:47.46, lon:37.64, sizeMeters:200, zoomLevel:18, stitchTiles:false}` | HTTP 200 + RegionStatusResponse(status="queued") | AC-2 |
+| missing-id | body without `id` field | HTTP 400 + `errors["id"]` | Inv-1 (probe gap) |
+| zero-guid-id | `id: "00000000-..."` | HTTP 400 + `errors["id"]` | Inv-1 |
+| missing-lat | body without `lat` | HTTP 400 + `errors["lat"]` | JsonRequired |
+| lat-out-of-range | `lat: 91` | HTTP 400 + `errors["lat"]` | Inv-2 |
+| missing-lon | body without `lon` | HTTP 400 + `errors["lon"]` | JsonRequired |
+| lon-out-of-range | `lon: 181` | HTTP 400 + `errors["lon"]` | Inv-3 |
+| missing-sizeMeters | body without `sizeMeters` | HTTP 400 + `errors["sizeMeters"]` | JsonRequired |
+| sizeMeters-out-of-range | `sizeMeters: 1000000` | HTTP 400 + `errors["sizeMeters"]` | Inv-4 |
+| missing-zoomLevel | body without `zoomLevel` | HTTP 400 + `errors["zoomLevel"]` | JsonRequired |
+| zoomLevel-out-of-range | `zoomLevel: 30` | HTTP 400 + `errors["zoomLevel"]` | Inv-5 |
+| missing-stitchTiles | body without `stitchTiles` | HTTP 400 + `errors["stitchTiles"]` | Inv-6 |
+| lat-type-mismatch | `lat: "fifty"` | HTTP 400 (deserializer JsonException) | wire-format failure |
+| unknown-root-field | body with `unknownField: 1` | HTTP 400 + `errors["unknownField"]` | Inv-7 |
+| legacy-latitude-name | body with `latitude:` instead of `lat:` | HTTP 400 + `errors["latitude"]` | AZ-812 hard switch |
+| auth-anonymous | no Bearer token | HTTP 401 | Standard `.RequireAuthorization()` baseline |
+| idempotent-double-post | same body POSTed twice | both HTTP 200; same `createdAt`; no duplicate background work | AC-2 + AZ-362 |
+
+## Change Log
+
+| Version | Date | Change | Author |
+|---------|------|--------|--------|
+| 1.0.0 | 2026-05-22 | Initial contract for `POST /api/satellite/request`. Publishes the post-AZ-812 OSM-convention wire format (`lat`/`lon`) and the AZ-808 strict-validation rules (non-zero `id`, range-checked `lat`/`lon`/`sizeMeters`/`zoomLevel`, explicit `stitchTiles`, unknown-field rejection). References `error-shape.md` v1.0.0 for the 400 body shape and `tile-inventory.md` v2.0.0 for the downstream read path (callers seed via region, then read via inventory). | autodev (Step 10, cycle 8) |

_docs/02_document/contracts/api/tile-latlon.md

@@ -0,0 +1,165 @@
+# Contract: tile-latlon
+
+**Component**: WebApi (`SatelliteProvider.Api`) producing rows via TileDownloader (`SatelliteProvider.Services.TileDownloader`)
+**Producer task**: AZ-811 — `_docs/02_tasks/done/AZ-811_latlon_get_endpoint_validation.md` (validator + this contract; renames query params `Latitude/Longitude/ZoomLevel` → `lat/lon/zoom` for OSM consistency)
+**Consumer tasks**: dev / debug clients, future mission-planner UI single-tile-by-click flows; NOT currently consumed by `gps-denied-onboard` (the onboard side uses `GET /tiles/{z}/{x}/{y}` with pre-computed coords from inventory)
+**Version**: 1.0.0
+**Status**: frozen
+**Last Updated**: 2026-05-22
+
+## Purpose
+
+Defines the HTTP contract for `GET /api/satellite/tiles/latlon` — the single-tile-by-coordinate read endpoint that converts a `(lat, lon, zoom)` triple to a slippy-map `(z, x, y)`, downloads the tile from Google Maps if not already cached, persists it, and returns the row's metadata as `DownloadTileResponse`. The actual tile bytes are served separately via `GET /tiles/{z}/{x}/{y}` once the caller has the resulting `(z, x, y)` (or the equivalent `tilePath` from the response).
+
+This is the v1.0.0 of the contract — published alongside AZ-811's validator landing. There is no prior contract document; the producer-doc surface before AZ-811 was `modules/api_program.md::GetTileByLatLon Handler` only.
+
+## Endpoint
+
+```
+GET /api/satellite/tiles/latlon?lat=<float>&lon=<float>&zoom=<int>
+Authorization: Bearer <JWT>
+```
+
+The request MUST carry a valid JWT (AZ-487). No `permissions` claim is required. Anonymous requests are rejected with HTTP 401.
+
+## Shape
+
+### Query parameters
+
+```
+?lat=47.461747&lon=37.647063&zoom=18
+```
+
+Per-parameter constraints:
+
+| Param | Type | Required | Description | Constraints |
+|-------|------|----------|-------------|-------------|
+| `lat` | number | yes | WGS84 latitude (decimal degrees). | `[-90.0, 90.0]`. |
+| `lon` | number | yes | WGS84 longitude (decimal degrees). | `[-180.0, 180.0]`. |
+| `zoom` | integer | yes | Slippy-map zoom level. | `[0, 22]`. |
+
+Strict shape: any query-string parameter outside `{lat, lon, zoom}` is rejected by `RejectUnknownQueryParamsEndpointFilter` with HTTP 400 + the unknown key name in `errors`. This catches typos like `?latitude=` (pre-AZ-811 wire name) that ASP.NET model binding would otherwise silently ignore, and it also rejects hostile fingerprinting probes like `?debug=1&admin=true`.
+
+**Required-field detection**: the bound DTO (`GetTileByLatLonQuery`) declares `lat` / `lon` / `zoom` as nullable (`double?`, `double?`, `int?`). Missing a query param therefore binds to `null` rather than throwing `BadHttpRequestException` from the framework binder — the request reaches the endpoint filters in all cases. `GetTileByLatLonQueryValidator` then enforces `NotNull` (chained `CascadeMode.Stop` ahead of the range rule) so a missing param surfaces as `errors[<paramName>]: ["\`<paramName>\` is required."]` exactly like any other validation failure. The handler dereferences `.Value` only after the validator filter has passed, guaranteed by the filter ordering.
+
+### Response body
+
+```jsonc
+{
+  "id": "e228d1aa-25d4-556e-a72d-e0484756e165",
+  "zoomLevel": 18,
+  "latitude": 47.461747,
+  "longitude": 37.647063,
+  "tileSizeMeters": 39.84,
+  "tileSizePixels": 256,
+  "imageType": "jpg",
+  "version": 1,
+  "filePath": "tiles/18/158485/91707.jpg",
+  "createdAt": "2026-05-22T12:34:56.789Z",
+  "updatedAt": "2026-05-22T12:34:56.789Z"
+}
+```
+
+Per-field semantics:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `id` | UUID | Deterministic UUIDv5 of the tile (`Uuidv5.TileNamespace, "{z}/{x}/{y}"`). |
+| `zoomLevel` | integer | Echoes the request `zoom` param. |
+| `latitude` | number | Tile centre latitude (server-resolved from slippy `(z,x,y)`; may differ from the request `lat` by up to half a tile). |
+| `longitude` | number | Tile centre longitude. |
+| `tileSizeMeters` | number | Approximate ground footprint of the tile at this zoom and latitude. |
+| `tileSizePixels` | integer | Fixed at 256 (slippy-map convention). |
+| `imageType` | string | Always `"jpg"`. |
+| `version` | integer | Tile row version (bumps on each refresh). |
+| `filePath` | string | Relative path under the tile cache root (`tiles/{z}/{x}/{y}.jpg`). |
+| `createdAt` | ISO-8601 UTC | Tile row creation timestamp. |
+| `updatedAt` | ISO-8601 UTC | Tile row last-modification timestamp. |
+
+Response field names are intentionally LEGACY (`zoomLevel`, `latitude`, `longitude`) — only the request shape (query params) was renamed by AZ-811. The response is shared with `tile-storage.md` for caller consistency.
+
+### Endpoint summary
+
+| Method | Path | Request | Response | Status codes |
+|--------|------|---------|----------|--------------|
+| `GET` | `/api/satellite/tiles/latlon` | query string `?lat&lon&zoom` | `DownloadTileResponse` | 200, 400, 401 |
+
+## Error shape
+
+All `400` responses conform to `_docs/02_document/contracts/api/error-shape.md` v1.0.0. Two enforcement layers produce identically-shaped bodies:
+
+1. **`RejectUnknownQueryParamsEndpointFilter`** (envelope, runs first) — rejects any query key outside `{lat, lon, zoom}` with `errors[<paramName>]: ["Unknown query parameter ..."]`. Catches typos and hostile probes.
+2. **`GetTileByLatLonQueryValidator`** (FluentValidation, runs second) — range-checks `lat` / `lon` / `zoom` with `errors[<paramName>]: ["... must be between ..."]`.
+
+Example body for a legacy-param-name failure (pre-AZ-811 wire format):
+
+```jsonc
+{
+  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+  "title": "One or more validation errors occurred.",
+  "status": 400,
+  "errors": {
+    "Latitude": ["Unknown query parameter `Latitude`. Allowed: `lat`, `lon`, `zoom`."],
+    "Longitude": ["Unknown query parameter `Longitude`. Allowed: `lat`, `lon`, `zoom`."],
+    "ZoomLevel": ["Unknown query parameter `ZoomLevel`. Allowed: `lat`, `lon`, `zoom`."]
+  }
+}
+```
+
+Example body for an out-of-range failure:
+
+```jsonc
+{
+  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+  "title": "One or more validation errors occurred.",
+  "status": 400,
+  "errors": {
+    "lat": ["`lat` must be between -90 and 90."]
+  }
+}
+```
+
+## Invariants
+
+- **Inv-1**: `lat ∈ [-90.0, 90.0]`. Out-of-range → 400 with `errors["lat"]`.
+- **Inv-2**: `lon ∈ [-180.0, 180.0]`. Out-of-range → 400 with `errors["lon"]`.
+- **Inv-3**: `zoom ∈ [0, 22]` (slippy-map zoom range, matching `tile-inventory.md` Inv-8 and `region-request.md` Inv-5).
+- **Inv-4** (AZ-811 envelope filter): Any query-string key outside `{lat, lon, zoom}` → 400 with `errors[<key>]`. This is the novel envelope-strictness layer introduced by AZ-811; reuse the filter on future query-string endpoints by passing a fresh allowed-keys set.
+- **Inv-5** (deterministic mapping): `(lat, lon, zoom)` deterministically resolves to a single slippy-map `(z, x, y)` and therefore to a single `Uuidv5.TileNamespace`-derived tile `id`. Re-requesting the same triple returns the SAME `id` (cache hit if the tile already exists). Cross-referenced from `common_uuidv5.md`.
+- **Inv-6** (cache reuse): If the resolved `(z, x, y)` already has a row in `tiles`, no new Google-Maps fetch occurs; the existing row's metadata is returned. The handler delegates this decision to `ITileService.DownloadAndStoreSingleTileAsync`.
+
+## Non-Goals
+
+- **Not covered**: tile body fetch. This endpoint returns metadata only. Bytes are served via `GET /tiles/{z}/{x}/{y}` (slippy-map URL).
+- **Not covered**: bulk download. Use `POST /api/satellite/tiles/inventory` for batch-lookup or `POST /api/satellite/request` for region pre-fetch.
+- **Not covered**: MGRS-based input. See `GET /api/satellite/tiles/mgrs` (stub, 501).
+- **Not covered**: backward-compatibility shim for `Latitude/Longitude/ZoomLevel` query param names. AZ-811 ships v1.0.0 directly with the post-rename names; pre-rename callers receive HTTP 400 from the envelope filter naming each unknown key. There is no transitional accept-both period.
+- **Not covered**: path-parameter validation on `GET /tiles/{z}/{x}/{y}` (the slippy-map body endpoint). That endpoint uses integer-binding which framework-validates the type but not the range; a separate task may add range checks if needed.
+
+## Versioning Rules
+
+- **Patch (1.0.x)**: Documentation clarifications, additional invariants that do not change wire behaviour.
+- **Minor (1.x.0)**: Adding an optional query param consumers may safely omit (e.g. `?format=png` if a non-jpg variant is later supported); adding an optional response field.
+- **Major (2.0.0)**: Changing any query-param name; tightening a range constraint that breaks current callers; removing `tileSizeMeters` from the response.
+
+## Test Cases
+
+| Case | Input | Expected | Notes |
+|------|-------|----------|-------|
+| happy-path | `?lat=47.461747&lon=37.647063&zoom=18` | HTTP 200 + DownloadTileResponse | AC-2 |
+| missing-lat | `?lon=37.647063&zoom=18` | HTTP 400 + `errors["lat"]: ["\`lat\` is required."]` | Inv-1 (NotNull rule) |
+| lat-out-of-range | `?lat=91&lon=37.647063&zoom=18` | HTTP 400 + `errors["lat"]` | Inv-1 (range rule) |
+| lon-out-of-range | `?lat=47.461747&lon=181&zoom=18` | HTTP 400 + `errors["lon"]` | Inv-2 |
+| zoom-out-of-range | `?lat=47.461747&lon=37.647063&zoom=30` | HTTP 400 + `errors["zoom"]` | Inv-3 |
+| legacy-param-names | `?Latitude=47.46&Longitude=37.64&ZoomLevel=18` (pre-AZ-811 wire format) | HTTP 400 + `errors["Latitude","Longitude","ZoomLevel"]` | Inv-4 (AZ-811 envelope) |
+| hostile-extra-keys | `?lat=...&lon=...&zoom=18&debug=1&admin=true` | HTTP 400 + `errors["debug","admin"]` | Inv-4 |
+| typo-zooom | `?lat=...&lon=...&zooom=18` | HTTP 400 + `errors["zooom"]` | Inv-4 |
+| lat-type-mismatch | `?lat=fifty&lon=...&zoom=18` | HTTP 400 (model-binder JsonException-equivalent) | Wire-format failure |
+| cache-reuse | repeat happy-path | HTTP 200; same `id`; no new GET to Google Maps | Inv-5 + Inv-6 |
+| auth-anonymous | no Bearer token | HTTP 401 | Standard `.RequireAuthorization()` baseline |
+
+## Change Log
+
+| Version | Date | Change | Author |
+|---------|------|--------|--------|
+| 1.0.0 | 2026-05-22 | Initial contract for `GET /api/satellite/tiles/latlon`. Publishes the post-AZ-811 OSM-convention query params (`lat`/`lon`/`zoom`) and the AZ-811 two-layer strict validation (envelope filter for unknown-keys + value-validator for range checks). References `error-shape.md` v1.0.0 for the 400 body shape and `tile-inventory.md` v2.0.0 for the bulk-lookup alternative. Pre-AZ-811 query-param names (`Latitude/Longitude/ZoomLevel`) are explicitly rejected by the envelope filter — no transitional shim. | autodev (Step 10, cycle 8) |

_docs/02_document/modules/api_program.md

@@ -9,7 +9,7 @@ Application entry point. Configures DI container, sets up middleware, defines mi
 | Method | Route | Handler | Description |
 |--------|-------|---------|-------------|
 | GET | `/tiles/{z}/{x}/{y}` | `ServeTile` | Slippy map tile server with in-memory caching. AZ-505 rewired the DB lookup to filter on `location_hash` (deterministic UUIDv5) so the read becomes an `Index Only Scan` against `tiles_leaflet_path`; the wire response is byte-identical to pre-AZ-505. |
-| GET | `/api/satellite/tiles/latlon` | `GetTileByLatLon` | Download single tile by lat/lon/zoom |
+| GET | `/api/satellite/tiles/latlon` | `GetTileByLatLon` | Download single tile by lat/lon/zoom. AZ-811 (cycle 8) renamed the query params `Latitude/Longitude/ZoomLevel` → `lat/lon/zoom` (OSM convention) and added strict validation: range-checked `lat`/`lon`/`zoom` via `WithValidation<GetTileByLatLonQuery>()`, plus a `RejectUnknownQueryParamsEndpointFilter` that rejects any extra query keys (catches typos like `?latitude=` that pre-AZ-811 silently bound to 0). Contract: `_docs/02_document/contracts/api/tile-latlon.md` v1.0.0 + `_docs/02_document/contracts/api/error-shape.md` v1.0.0. |
 | POST | `/api/satellite/tiles/inventory` | `GetTilesInventory` | Bulk tile-existence/metadata lookup (AZ-505) — body is XOR of `tiles[{z,x,y}]` (Form A) and `locationHashes[uuid]` (Form B), each capped at 5000 entries. Response is one entry per request entry, in input order. AZ-794 (cycle 7) renamed the coord triple from `tileZoom/tileX/tileY` → `z/x/y` (OSM convention); AZ-796 (cycle 7) added strict input validation via `WithValidation<TileInventoryRequest>()` so malformed payloads return RFC 7807 `ValidationProblemDetails` instead of silently coercing to zero. Contracts: `_docs/02_document/contracts/api/tile-inventory.md` v2.0.0 + `_docs/02_document/contracts/api/error-shape.md` v1.0.0. |
 | GET | `/api/satellite/tiles/mgrs` | `GetSatelliteTilesByMgrs` | MGRS stub (returns empty) |
 | POST | `/api/satellite/upload` | `UploadUavTileBatch` | UAV tile batch upload (AZ-488) — multipart envelope, 5-rule quality gate, per-source UPSERT with `source='uav'`. Requires the `RequiresGpsPermission` policy. |
@@ -21,7 +21,14 @@ Application entry point. Configures DI container, sets up middleware, defines mi
 ### Local Records (defined in Program.cs)
 - `GetSatelliteTilesResponse`, `SatelliteTile` — MGRS response stubs
 - `DownloadTileResponse` — tile download response
-- `ParameterDescriptionFilter` — Swagger operation filter
+- `ParameterDescriptionFilter` — Swagger operation filter (AZ-811 cycle 8 trimmed the obsolete `Latitude`/`Longitude`/`ZoomLevel` entries; the surviving `lat`/`lon`/`mgrs`/`squareSideMeters` keys still annotate query-string params)
+
+### Api/Validators (AZ-795 epic, AZ-811 cycle 8)
+- `RejectUnknownQueryParamsEndpointFilter` — `IEndpointFilter` parameterized by an allowed-keys set; rejects unknown query-string parameters with RFC 7807 `ValidationProblemDetails`. Apply BEFORE `WithValidation<T>()` so unknown-param errors precede range checks against the bound default value.
+- `GetTileByLatLonQueryValidator` — `AbstractValidator<GetTileByLatLonQuery>` with `lat`/`lon`/`zoom` rules. Each rule chains `Cascade(CascadeMode.Stop) → NotNull → InclusiveBetween` so a missing param surfaces ONLY as `"\`<paramName>\` is required."` (no spurious range error against a null sentinel).
+
+### Api/DTOs (AZ-811 cycle 8)
+- `GetTileByLatLonQuery` — `record GetTileByLatLonQuery(double? Lat, double? Lon, int? Zoom)` with `[FromQuery(Name="lat"|"lon"|"zoom")]` on each property. Bound via `[AsParameters]` on the `GetTileByLatLon` handler. **Nullable on purpose**: minimal-API binding throws `BadHttpRequestException` for missing non-nullable query params BEFORE endpoint filters run; that short-circuit produces a plain `ProblemDetails` via `GlobalExceptionHandler` with no `errors{}` envelope. Nullable types let binding always succeed so the envelope filter + validator handle the failure surface uniformly per `error-shape.md` v1.0.0. The handler dereferences `.Value` only after the validator filter passes.
 
 ### Common/DTO (region API)
 - `RequestRegionRequest` — `POST /api/satellite/request` body. Moved out of Program.cs by AZ-369. Fields: `Id` (Guid), `Lat`/`Lon` (double, JSON `lat`/`lon` per AZ-812 cycle 8 OSM rename), `SizeMeters`, `ZoomLevel` (int, default 18), `StitchTiles` (bool, default false).
@@ -89,7 +96,12 @@ Application entry point. Configures DI container, sets up middleware, defines mi
 5. Authenticated by `.RequireAuthorization()` (401 before validation runs for anonymous requests).
 
 ### GetTileByLatLon Handler
-Downloads a tile, persists it, returns metadata as `DownloadTileResponse`.
+Binds `[AsParameters] GetTileByLatLonQuery` (record with nullable `[FromQuery(Name="lat"|"lon"|"zoom")]` properties — see `Api/DTOs` for nullability rationale). Wire-format params are OSM-short `lat`/`lon`/`zoom` post-AZ-811. Strict validation is layered:
+1. `RejectUnknownQueryParamsEndpointFilter(new[] {"lat","lon","zoom"})` runs first — rejects any unexpected query key (e.g. `?latitude=` typo, or hostile fingerprinting probes) with RFC 7807 `ValidationProblemDetails` and an `errors[<paramName>]` entry.
+2. `WithValidation<GetTileByLatLonQuery>()` runs second — checks `NotNull` (missing param → `errors[<paramName>]: "\`<paramName>\` is required."`) and `InclusiveBetween` (`lat` ∈ [-90, 90], `lon` ∈ [-180, 180], `zoom` ∈ [0, 22]). `CascadeMode.Stop` ensures null short-circuits the range check.
+3. Handler dereferences `query.Lat!.Value`, `query.Lon!.Value`, `query.Zoom!.Value` (validator guarantees non-null), delegates to `ITileService.DownloadAndStoreSingleTileAsync(lat, lon, zoom)`, and returns `DownloadTileResponse`.
+
+The two filter layers produce identically-shaped ProblemDetails bodies. The `RejectUnknownQueryParamsEndpointFilter` is reusable — register it once per allowed-key set on any future query-string endpoint that needs the same shape-strictness.
 
 ### RequestRegion Handler
 Validates size (100–10000m), delegates to `IRegionService.RequestRegionAsync`.

_docs/02_document/modules/common_uuidv5.md

@@ -35,7 +35,7 @@ All members are static on `Uuidv5`:
 | `"18/12345/23456"` | `38b26f49-a966-5121-aaf4-9cc476f57869` |
 | `"18/12345/23456/google_maps/00000000-0000-0000-0000-000000000000"` | `e228d1aa-25d4-556e-a72d-e0484756e165` |
 
-The second value is observable end-to-end: a fresh `GET /api/satellite/tiles/latlon?Latitude=47.461747&Longitude=37.647063&ZoomLevel=18` returns `tileId = e228d1aa-25d4-556e-a72d-e0484756e165` because `(47.461747, 37.647063)` maps to slippy `(z=18, x=158485, y=91707)` — and the integration test asserts that exact value.
+The second value is observable end-to-end: a fresh `GET /api/satellite/tiles/latlon?lat=47.461747&lon=37.647063&zoom=18` returns `tileId = e228d1aa-25d4-556e-a72d-e0484756e165` because `(47.461747, 37.647063)` maps to slippy `(z=18, x=158485, y=91707)` — and the integration test asserts that exact value. (AZ-811 cycle 8 renamed the query params `Latitude/Longitude/ZoomLevel` → `lat/lon/zoom` for OSM consistency.)
 
 ## Dependencies
 

_docs/02_document/system-flows.md

@@ -32,11 +32,11 @@
 
 ### Description
 
-Client requests a single satellite tile by geographic coordinates and zoom level. The service checks the cache (DB), downloads from Google Maps if not cached, stores it, and returns metadata.
+Client requests a single satellite tile by geographic coordinates and zoom level. The service checks the cache (DB), downloads from Google Maps if not cached, stores it, and returns metadata. The wire-format contract is `_docs/02_document/contracts/api/tile-latlon.md` v1.0.0; failure responses follow `error-shape.md` v1.0.0.
 
 ### Preconditions
 
-- Valid latitude, longitude, and zoom level provided
+- Query params `lat` ∈ [-90, 90], `lon` ∈ [-180, 180], `zoom` ∈ [0, 22]. Any unknown query key (e.g. legacy `?Latitude=` typo) is rejected by `RejectUnknownQueryParamsEndpointFilter` (AZ-811 cycle 8) with HTTP 400. Range checks via `GetTileByLatLonQueryValidator`.
 - Google Maps session token configured
 
 ### Sequence Diagram
@@ -80,11 +80,11 @@ sequenceDiagram
 
 ### Description
 
-Client submits a region definition (center point, size, zoom). The request is persisted and queued for asynchronous processing.
+Client submits a region definition (center point, size, zoom). The request is persisted and queued for asynchronous processing. The wire-format contract is `_docs/02_document/contracts/api/region-request.md` v1.0.0; failure responses follow `error-shape.md` v1.0.0.
 
 ### Preconditions
 
-- Valid region parameters (lat, lon, size_meters, zoom_level)
+- Valid region parameters: non-zero `id` (UUID), `lat` ∈ [-90, 90], `lon` ∈ [-180, 180], `sizeMeters` ∈ [100, 10000], `zoomLevel` ∈ [0, 22], explicit `stitchTiles` (bool, no default). Enforced by `RegionRequestValidator` + `[JsonRequired]` at the API edge (AZ-808 cycle 8).
 
 ### Sequence Diagram
 

_docs/02_document/tests/blackbox-tests.md

@@ -2,7 +2,7 @@
 
 ## BT-01: Single Tile Download
 
-**Trigger**: GET /api/satellite/tiles/latlon?Latitude=47.461747&Longitude=37.647063&ZoomLevel=18
+**Trigger**: GET /api/satellite/tiles/latlon?lat=47.461747&lon=37.647063&zoom=18
 **Precondition**: Tile not in cache
 **Expected**: HTTP 200; JSON with zoomLevel=18, tileSizePixels=256, imageType="jpg", filePath matching pattern `tiles/18/*/...`
 **Pass criterion**: All fields present and correct values
@@ -86,13 +86,13 @@
 
 ## BT-N01: Invalid Coordinates (out of range)
 
-**Trigger**: GET /api/satellite/tiles/latlon?Latitude=91&Longitude=181&ZoomLevel=18
+**Trigger**: GET /api/satellite/tiles/latlon?lat=91&lon=181&zoom=18
 **Expected**: Error response
 **Pass criterion**: HTTP 4xx or error in response body
 
 ## BT-N02: Invalid Zoom Level
 
-**Trigger**: GET /api/satellite/tiles/latlon?Latitude=47.46&Longitude=37.64&ZoomLevel=25
+**Trigger**: GET /api/satellite/tiles/latlon?lat=47.46&lon=37.64&zoom=25
 **Expected**: Error response
 **Pass criterion**: HTTP 4xx or error indicating invalid zoom
 
@@ -163,7 +163,7 @@ All Cycle-2 UAV scenarios run with a JWT containing `permissions: ["GPS"]` (per
 
 ## BT-18: Existing Tile Endpoint Returns Identical Body with Valid Bearer
 
-**Trigger**: GET `/api/satellite/tiles/latlon?Latitude=47.461747&Longitude=37.647063&ZoomLevel=18` with a valid Bearer token.
+**Trigger**: GET `/api/satellite/tiles/latlon?lat=47.461747&lon=37.647063&zoom=18` with a valid Bearer token.
 **Precondition**: Tile may or may not be cached.
 **Expected**: Response body is structurally identical to BT-01 (`tileId`, `zoomLevel == 18`, `tileSizePixels == 256`, `imageType == "jpg"`, `filePath` matches `tiles/18/*/*`).
 **Pass criterion**: status == 200 AND BT-01's pass criterion AND no behavioral change vs pre-AZ-487 baseline.

_docs/02_document/tests/security-tests.md

@@ -2,7 +2,7 @@
 
 ## SEC-01: SQL Injection via Coordinate Parameters
 
-**Trigger**: GET /api/satellite/tiles/latlon?Latitude=1;DROP TABLE tiles--&Longitude=1&ZoomLevel=18
+**Trigger**: GET /api/satellite/tiles/latlon?lat=1;DROP TABLE tiles--&lon=1&zoom=18
 **Expected**: Request rejected or treated as invalid parameter
 **Pass criterion**: HTTP 400 or parameter parsing error; no database damage; tiles table intact
 
@@ -32,7 +32,7 @@ The pre-AZ-487 assumption "no authentication" is superseded by these scenarios.
 
 ## SEC-05: Anonymous Request to Any Authenticated Endpoint Returns 401
 
-**Trigger**: GET `/api/satellite/tiles/latlon?Latitude=...&Longitude=...&ZoomLevel=18` (or any `/api/satellite/*` endpoint) with NO `Authorization` header.
+**Trigger**: GET `/api/satellite/tiles/latlon?lat=...&lon=...&zoom=18` (or any `/api/satellite/*` endpoint) with NO `Authorization` header.
 **Precondition**: API running with `JWT_SECRET` configured.
 **Expected**: HTTP 401 Unauthorized; `WWW-Authenticate: Bearer` header present; response body does not leak validation internals.
 **Pass criterion**: status == 401 AND `WWW-Authenticate` header starts with `Bearer`.

_docs/03_implementation/batch_02_cycle8_report.md

@@ -0,0 +1,106 @@
+# Batch Report
+
+**Batch**: 02 (cycle 8)
+**Tasks**: AZ-808 (Region POST strict validation) + AZ-811 (lat/lon GET strict validation)
+**Date**: 2026-05-22
+
+## Task Results
+
+| Task | Status | Files Modified | Tests | AC Coverage | Issues |
+|------|--------|---------------|-------|-------------|--------|
+| AZ-808_region_endpoint_validation | Done | 10 files (4 new) | smoke pass (mode=smoke, exit 0); 10 integration tests added | 8/8 ACs covered | none |
+| AZ-811_latlon_get_endpoint_validation | Done | 19 files (8 new) | smoke pass; 8 integration tests + 4 filter unit tests + 9 validator unit tests added | 9/9 ACs covered | 1 Info (nullable DTO rationale, documented) |
+
+## AC Test Coverage
+
+### AZ-808 (8/8 ACs)
+| AC | Coverage |
+|----|----------|
+| AC-1 | `RegionRequestValidator` exists at `SatelliteProvider.Api/Validators/RegionRequestValidator.cs` with rules for `id` (non-empty), `lat` (`[-90, 90]`), `lon` (`[-180, 180]`), `sizeMeters` (`[100, 10000]`), `zoomLevel` (`[0, 22]`). |
+| AC-2 | Happy path: `RegionRequestValidationTests.HappyPath_Returns200` returns HTTP 200. Smoke green. |
+| AC-3 | Wired via `.WithValidation<RequestRegionRequest>()` in `Program.cs` MapPost chain. |
+| AC-4 | `RequestRegionRequest` has `[JsonRequired]` on every property (id, lat, lon, sizeMeters, zoomLevel, stitchTiles); missing-required produces `errors[]` via `GlobalExceptionHandler`'s `JsonException` path. Tested by `MissingId_Returns400` and `MissingStitchTiles_Returns400`. |
+| AC-5 | Unit tests `SatelliteProvider.Tests/Validators/RegionRequestValidatorTests.cs` — 11 methods covering each rule with positive + negative cases. |
+| AC-6 | Integration tests `SatelliteProvider.IntegrationTests/RegionRequestValidationTests.cs` — 10 methods covering happy + 9 failure modes; all green in smoke. |
+| AC-7 | New contract `_docs/02_document/contracts/api/region-request.md` v1.0.0 published. References `error-shape.md` v1.0.0 for 400 body shape. |
+| AC-8 | Probe script `scripts/probe_region_validation.sh` covers happy + each failure mode via curl. |
+
+### AZ-811 (9/9 ACs)
+| AC | Coverage |
+|----|----------|
+| AC-1 | 5 validations enforced: lat/lon/zoom range (validator), unknown-key (envelope filter), type-mismatch (model binder via `GlobalExceptionHandler`). All produce HTTP 400 + ValidationProblemDetails per `error-shape.md` v1.0.0. |
+| AC-2 | Happy path: `GetTileByLatLonValidationTests.HappyPath_Returns200` returns HTTP 200 + `DownloadTileResponse`. Smoke green. |
+| AC-3 | `GetTileByLatLonQueryValidator` lives at `SatelliteProvider.Api/Validators/`; unit tests cover 9 methods (3 per RuleFor + 3 null cases). |
+| AC-4 | Integration tests cover 8 methods: happy + 3 range + 1 missing + 2 unknown (legacy + hostile) + 1 type-mismatch. |
+| AC-5 | New contract `_docs/02_document/contracts/api/tile-latlon.md` v1.0.0 published. References `error-shape.md` v1.0.0 + `tile-inventory.md` v2.0.0. |
+| AC-6 | `_docs/02_document/modules/api_program.md::GetTileByLatLon Handler` updated; references the validator + new contract + the envelope filter ordering. |
+| AC-7 | OpenAPI: `.Accepts<>` not needed for GET; `.Produces<DownloadTileResponse>(200)` + `.ProducesProblem(400)` declared on the endpoint chain. Swagger `ParameterDescriptionFilter` updated to describe lat/lon/zoom (post-rename). |
+| AC-8 | Probe script `scripts/probe_latlon_validation.sh` covers happy + missing-lat/lon/zoom + 3 out-of-range + 3 unknown-key + 1 type-mismatch = 11 probes. |
+| AC-9 | `RejectUnknownQueryParamsEndpointFilter` documented in `_docs/02_document/modules/api_program.md::Api/Validators` as a reusable component for the next query-param endpoint. |
+
+## Code Review Verdict: PASS_WITH_NOTES
+See `_docs/03_implementation/reviews/batch_02_cycle8_review.md` for the single Info finding (nullable DTO rationale, documented in code + doc).
+
+## Auto-Fix Attempts: 1 (mid-batch)
+- AZ-811 initially used non-nullable types on `GetTileByLatLonQuery`. The first smoke run uncovered the failing case `UnknownQueryParam_LegacyLatitude_Returns400`: minimal-API binding threw `BadHttpRequestException` for missing `lat` BEFORE the envelope filter could run, producing a plain `ProblemDetails` (no `errors{}` envelope) — a spec-AC violation.
+- Root-cause investigation via diagnostic instrumentation (`Console.Error.WriteLine` in the filter + `Console.WriteLine` of the raw body in the failing test) confirmed the binder short-circuit before the filter.
+- Fix: nullable types on the DTO + `NotNull` + `CascadeMode.Stop` in the validator + `.Value` dereference in the handler. Rationale documented in `GetTileByLatLonQuery.cs` and `api_program.md::Api/DTOs`.
+- Smoke re-run after fix: all green (no skipped tests, no flakes).
+
+## Stuck Agents: None
+
+## Files Modified
+
+### AZ-808
+| Path | Kind |
+|------|------|
+| `SatelliteProvider.Common/DTO/RequestRegionRequest.cs` | `[JsonRequired]` on every property + removed implicit defaults |
+| `SatelliteProvider.Api/Validators/RegionRequestValidator.cs` | **NEW** |
+| `SatelliteProvider.Api/Program.cs` | `.WithValidation<RequestRegionRequest>()` + removed inline size check |
+| `SatelliteProvider.Tests/Validators/RegionRequestValidatorTests.cs` | **NEW** |
+| `SatelliteProvider.IntegrationTests/RegionRequestValidationTests.cs` | **NEW** |
+| `SatelliteProvider.IntegrationTests/Program.cs` | Wired into smoke + full suites |
+| `scripts/probe_region_validation.sh` | **NEW** |
+| `_docs/02_document/contracts/api/region-request.md` | **NEW** v1.0.0 |
+| `_docs/02_document/modules/api_program.md` | RequestRegion handler description |
+| `_docs/02_document/system-flows.md` | F2 description |
+
+### AZ-811
+| Path | Kind |
+|------|------|
+| `SatelliteProvider.Api/DTOs/GetTileByLatLonQuery.cs` | **NEW** (nullable record) |
+| `SatelliteProvider.Api/Validators/GetTileByLatLonQueryValidator.cs` | **NEW** |
+| `SatelliteProvider.Api/Validators/RejectUnknownQueryParamsEndpointFilter.cs` | **NEW** (reusable) |
+| `SatelliteProvider.Api/Program.cs` | Endpoint filter + .WithValidation + handler signature + .Value deref |
+| `SatelliteProvider.Api/Swagger/ParameterDescriptionFilter.cs` | lat/lon/zoom descriptions |
+| `SatelliteProvider.Tests/Validators/GetTileByLatLonQueryValidatorTests.cs` | **NEW** (9 methods) |
+| `SatelliteProvider.Tests/Validators/RejectUnknownQueryParamsEndpointFilterTests.cs` | **NEW** (4 methods) |
+| `SatelliteProvider.IntegrationTests/GetTileByLatLonValidationTests.cs` | **NEW** (8 methods) |
+| `SatelliteProvider.IntegrationTests/TileTests.cs` | URL `?lat=&lon=&zoom=` |
+| `SatelliteProvider.IntegrationTests/JwtIntegrationTests.cs` | `ProtectedTilesPath` const |
+| `SatelliteProvider.IntegrationTests/SecurityTests.cs` | SQLi probe URL |
+| `SatelliteProvider.IntegrationTests/Program.cs` | Wired into smoke + full suites |
+| `scripts/probe_latlon_validation.sh` | **NEW** |
+| `scripts/run-performance-tests.sh` | PT-01 URL update |
+| `README.md` | Endpoint example |
+| `_docs/02_document/contracts/api/tile-latlon.md` | **NEW** v1.0.0 |
+| `_docs/02_document/modules/api_program.md` | Handler + Api/Validators + Api/DTOs |
+| `_docs/02_document/modules/common_uuidv5.md` | Example URL |
+| `_docs/02_document/system-flows.md` | F1 description |
+| `_docs/02_document/tests/blackbox-tests.md` | BT-01/N01/N02/18 triggers |
+| `_docs/02_document/tests/security-tests.md` | SEC-01/05 triggers |
+
+### Shared
+| Path | Kind |
+|------|------|
+| `SatelliteProvider.IntegrationTests/ProblemDetailsAssertions.cs` | Promoted `AssertErrorsContainsMention` to shared helper (closes batch-1 DRY warning) |
+| `SatelliteProvider.IntegrationTests/TileInventoryValidationTests.cs` | Use shared helper |
+| `SatelliteProvider.IntegrationTests/RegionFieldRenameTests.cs` | Use shared helper |
+
+## Tracker
+
+- AZ-808: To Do → In Progress (batch 2 start) → **In Testing** (post-smoke).
+- AZ-811: To Do → In Progress (batch 2 start) → **In Testing** (post-smoke).
+
+## Next Batch
+Batch 3: AZ-809 — route-creation validator (3 DTOs, cross-field constraint: regionSizeMeters covers geofence overlap). Spec calls for a slightly more complex pattern than batch-2 because the validator has to inspect three child DTOs (route metadata + intermediate-points policy + geofence array).

_docs/03_implementation/reviews/batch_02_cycle8_review.md

@@ -0,0 +1,151 @@
+# Code Review Report
+
+**Batch**: 02 (cycle 8)
+**Tasks**: AZ-808 (Region POST endpoint strict validation) + AZ-811 (lat/lon GET endpoint strict validation)
+**Date**: 2026-05-22
+**Verdict**: PASS_WITH_NOTES
+
+## Findings
+
+| # | Severity | Category | File:Line | Title |
+|---|----------|----------|-----------|-------|
+| 1 | Info | Design rationale | `SatelliteProvider.Api/DTOs/GetTileByLatLonQuery.cs:1-30` | DTO uses `double?` / `int?` on purpose to dodge minimal-API "Required parameter not provided" short-circuit |
+
+### Finding Details
+
+**F1: `GetTileByLatLonQuery` uses nullable types on purpose** (Info / Design rationale)
+- Location: `SatelliteProvider.Api/DTOs/GetTileByLatLonQuery.cs:17-20`
+- Description: The DTO declares `Lat`/`Lon`/`Zoom` as `double?`/`double?`/`int?`. Non-nullable variants would feel simpler but cause the minimal-API parameter binder to throw `BadHttpRequestException` BEFORE endpoint filters run when a query param is missing. That short-circuit produces a plain `ProblemDetails` via `GlobalExceptionHandler` — no `errors{}` envelope, no per-field key — which violates AZ-811 ACs 1 and 4 (every failure mode must surface as `errors.<paramName>`).
+- Initial implementation used non-nullable types. Diagnostic instrumentation captured the failing test response body (`{"title":"Bad Request","status":400,"detail":"Required parameter \"double Lat\" was not provided from query string."}`) which proved the binder was short-circuiting. Fix: switch to nullable + add `NotNull()` rule in the validator with `CascadeMode.Stop` ahead of the range rule. The handler dereferences `.Value` only after the validator filter passes.
+- Suggestion: NONE — the rationale is now documented in both the DTO XML/doc comment and `api_program.md::Api/DTOs`. Captured here so a future reader doesn't "simplify" the types back to non-nullable.
+- Task: AZ-811
+
+## Phase Summary
+
+| Phase | Outcome |
+|-------|---------|
+| 1. Context Loading | Read AZ-808 + AZ-811 specs, `_docs/02_document/contracts/api/tile-inventory.md` (validator pattern reference from cycle 7), and the cycle-7 `ValidationEndpointFilter<T>` shared infra. Both tasks share batch 2 because both wire `WithValidation<T>()` and reuse the cycle-7 validation envelope. |
+| 2. Spec Compliance | **AZ-808**: AC-1..AC-8 all ✓. New `RegionRequestValidator` covers `id`/`lat`/`lon`/`sizeMeters`/`zoomLevel`. `[JsonRequired]` on `RequestRegionRequest` enforces required-field at the deserializer (no defaulting). New contract `region-request.md` v1.0.0 published. Unit + integration tests cover happy path + each rule + missing-required + type-mismatch. Probe script exercises every failure mode via `curl`. **AZ-811**: AC-1..AC-9 all ✓. New `GetTileByLatLonQueryValidator` covers `lat`/`lon`/`zoom` with explicit `NotNull` for missing + `InclusiveBetween` for range (CascadeMode.Stop). New `RejectUnknownQueryParamsEndpointFilter` rejects any query key outside `{lat, lon, zoom}` with `Results.ValidationProblem`. New contract `tile-latlon.md` v1.0.0 published. Unit tests for both validator (7 methods) and filter (4 methods); integration tests cover happy path + 6 failure modes. Probe script exercises every failure mode. |
+| 3. Code Quality | Mechanical patterns followed; new validators and filter are minimal and SRP-clean. One Info finding (F1) on the nullable-DTO design — surfaced rather than left implicit. Cycle-7 `AssertErrorsContainsMention` helper promoted to `ProblemDetailsAssertions.cs` (closes the Low-severity DRY warning from batch-1 review). |
+| 4. Security | `RejectUnknownQueryParamsEndpointFilter` rejects fingerprinting probes (`?debug=1&admin=true`, `?Latitude=...&Longitude=...`) with HTTP 400 + named keys — no enumeration vector. `RegionRequestValidator` runs BEFORE any DB work (idempotency lookup, queueing). No SQL injection vectors, no hardcoded secrets, no PII in logs. JWT auth retained on both endpoints. |
+| 5. Performance | Validators run synchronously against in-memory record fields — negligible cost vs the Google-Maps round-trip or DB write that follows. Endpoint filter inspects `Query.Keys` (in-memory dictionary scan). No N+1, no blocking I/O. |
+| 6. Cross-Task Consistency | Both tasks share `ValidationEndpointFilter<T>` infra from cycle 7 and the new shared `ProblemDetailsAssertions.AssertErrorsContainsMention`. `RegionRequestValidator` and `GetTileByLatLonQueryValidator` follow the same `Cascade(Stop).NotNull().InclusiveBetween()` pattern. Both produce identically-shaped `ValidationProblemDetails` per `error-shape.md` v1.0.0. |
+| 7. Architecture Compliance | DTOs in `SatelliteProvider.Common/DTO/` (Region) and `SatelliteProvider.Api/DTOs/` (latlon query) — the query record is API-local because its `[FromQuery]` binding semantics are not reusable outside the API layer. Validators co-located with the API at `SatelliteProvider.Api/Validators/`. No layering violations. No cycles, no public-API bypasses, no ADR breaches. |
+
+## Files Reviewed
+
+### AZ-808 (Region POST validator)
+- `SatelliteProvider.Common/DTO/RequestRegionRequest.cs` — `[JsonRequired]` on every property; removed default values for `ZoomLevel` and `StitchTiles` so callers cannot rely on implicit defaults.
+- `SatelliteProvider.Api/Validators/RegionRequestValidator.cs` — **NEW** — 5 rules (id non-empty + 4 range rules).
+- `SatelliteProvider.Api/Program.cs` (lines around `MapPost("/api/satellite/request", ...)`) — added `.WithValidation<RequestRegionRequest>()`, `.Accepts<>`, `.Produces<>`, `.ProducesProblem()`. Removed inline `request.SizeMeters` size check (now in validator).
+- `SatelliteProvider.Tests/Validators/RegionRequestValidatorTests.cs` — **NEW** — Theory + Fact coverage for each rule, positive and negative.
+- `SatelliteProvider.IntegrationTests/RegionRequestValidationTests.cs` — **NEW** — Happy + empty body + missing/zero GUID + 4 out-of-range + missing-stitch + type mismatch.
+- `SatelliteProvider.IntegrationTests/Program.cs` — wired `RegionRequestValidationTests.RunAll` into smoke + full suites.
+- `scripts/probe_region_validation.sh` — **NEW** — curl probes for every failure mode.
+- `_docs/02_document/contracts/api/region-request.md` — **NEW** — v1.0.0 contract (no prior version existed).
+- `_docs/02_document/modules/api_program.md` — RequestRegion handler description updated; references new contract.
+- `_docs/02_document/system-flows.md::F2` — references new contract + validator.
+
+### AZ-811 (lat/lon GET validator)
+- `SatelliteProvider.Api/DTOs/GetTileByLatLonQuery.cs` — **NEW** — nullable record with `[FromQuery(Name = ...)]` per property. Rationale documented in-file (F1).
+- `SatelliteProvider.Api/Validators/GetTileByLatLonQueryValidator.cs` — **NEW** — `Cascade(Stop).NotNull().InclusiveBetween` per param.
+- `SatelliteProvider.Api/Validators/RejectUnknownQueryParamsEndpointFilter.cs` — **NEW** — reusable `IEndpointFilter` parameterised by allowed-keys set (case-insensitive). Returns `Results.ValidationProblem` with one error per unknown key.
+- `SatelliteProvider.Api/Program.cs` (lines around `MapGet("/api/satellite/tiles/latlon", ...)`) — added envelope filter + `.WithValidation<GetTileByLatLonQuery>()`. Handler signature now `[AsParameters] GetTileByLatLonQuery query`; dereferences `query.Lat!.Value` etc.
+- `SatelliteProvider.Api/Swagger/ParameterDescriptionFilter.cs` — descriptions for `lat`/`lon`/`zoom` (post-rename); removed legacy `Latitude`/`Longitude`/`ZoomLevel` entries.
+- `SatelliteProvider.Tests/Validators/GetTileByLatLonQueryValidatorTests.cs` — **NEW** — 9 methods incl. null cases.
+- `SatelliteProvider.Tests/Validators/RejectUnknownQueryParamsEndpointFilterTests.cs` — **NEW** — 4 methods (delegation, unknown-key block, legacy PascalCase, case-insensitive allowed-set).
+- `SatelliteProvider.IntegrationTests/GetTileByLatLonValidationTests.cs` — **NEW** — Happy + 3 out-of-range + 1 missing-required + 2 unknown-key (legacy + hostile) + 1 type-mismatch = 8 methods.
+- `SatelliteProvider.IntegrationTests/Program.cs` — wired `GetTileByLatLonValidationTests.RunAll` into smoke + full suites.
+- `SatelliteProvider.IntegrationTests/TileTests.cs` — URL `?Latitude=&Longitude=&ZoomLevel=` → `?lat=&lon=&zoom=`.
+- `SatelliteProvider.IntegrationTests/JwtIntegrationTests.cs` — `ProtectedTilesPath` const updated.
+- `SatelliteProvider.IntegrationTests/SecurityTests.cs` — SQLi probe URL updated.
+- `scripts/probe_latlon_validation.sh` — **NEW** — curl probes incl. missing-lat, hostile probes, type mismatch.
+- `scripts/run-performance-tests.sh` — PT-01 URL updated.
+- `README.md` — endpoint example updated.
+- `_docs/02_document/contracts/api/tile-latlon.md` — **NEW** — v1.0.0 contract (no prior version existed).
+- `_docs/02_document/modules/api_program.md` — handler + `Api/Validators` + `Api/DTOs` sections updated.
+- `_docs/02_document/modules/common_uuidv5.md` — example URL updated.
+- `_docs/02_document/system-flows.md::F1` — references new contract + validation layers.
+- `_docs/02_document/tests/blackbox-tests.md` — BT-01, BT-N01, BT-N02, BT-18 triggers updated.
+- `_docs/02_document/tests/security-tests.md` — SEC-01, SEC-05 triggers updated.
+
+### Shared (cross-task hygiene)
+- `SatelliteProvider.IntegrationTests/ProblemDetailsAssertions.cs` — `AssertErrorsContainsMention` promoted from per-test-file private helper to public static. Closes batch-1 Low-severity DRY warning.
+- `SatelliteProvider.IntegrationTests/TileInventoryValidationTests.cs` — uses shared helper.
+- `SatelliteProvider.IntegrationTests/RegionFieldRenameTests.cs` — uses shared helper; removed unused `using` directives.
+
+## Test Evidence
+
+`./scripts/run-tests.sh --smoke` (`integration-tests` container exit code 0):
+
+```
+Test: POST /api/satellite/request strict validation (AZ-808)
+============================================================
+
+AZ-808 AC-2: well-formed body → HTTP 200
+  ✓ {id,lat,lon,sizeMeters,zoomLevel,stitchTiles} accepted with HTTP 200
+
+AZ-808 rule (id-empty): id=Guid.Empty → HTTP 400
+  ✓ id=Guid.Empty rejected with errors["id"]
+
+AZ-808 rule (id-missing): missing id → HTTP 400 via [JsonRequired]
+  ✓ Missing id rejected via [JsonRequired] (no defaulting to Guid.Empty)
+
+AZ-808 rule (lat-out-of-range): lat=91 → HTTP 400
+  ✓ lat=91 rejected with errors["lat"]
+
+AZ-808 rule (lon-out-of-range): lon=181 → HTTP 400
+  ✓ lon=181 rejected with errors["lon"]
+
+AZ-808 rule (sizeMeters-out-of-range): sizeMeters=50 → HTTP 400
+  ✓ sizeMeters=50 rejected with errors["sizeMeters"]
+
+AZ-808 rule (zoomLevel-out-of-range): zoomLevel=30 → HTTP 400
+  ✓ zoomLevel=30 rejected with errors["zoomLevel"]
+
+AZ-808 rule (stitchTiles-missing): missing stitchTiles → HTTP 400 via [JsonRequired]
+  ✓ Missing stitchTiles rejected via [JsonRequired]
+
+AZ-808 rule (type-mismatch): lat="bad" → HTTP 400
+  ✓ Non-numeric lat rejected with HTTP 400
+
+AZ-808 empty body → HTTP 400
+  ✓ Empty body rejected with HTTP 400
+✓ POST /api/satellite/request validation tests: PASSED
+
+Test: GET /api/satellite/tiles/latlon strict validation (AZ-811)
+================================================================
+
+AZ-811 AC-2: well-formed query → HTTP 200
+  ✓ {lat,lon,zoom} accepted with HTTP 200
+
+AZ-811 rule 1: lat out of range (-90..90) → HTTP 400
+  ✓ lat=91 rejected with errors["lat"]
+
+AZ-811 rule 2: lon out of range (-180..180) → HTTP 400
+  ✓ lon=181 rejected with errors["lon"]
+
+AZ-811 rule 3: zoom out of range (0..22) → HTTP 400
+  ✓ zoom=30 rejected with errors["zoom"]
+
+AZ-811 rule 1: missing `lat` query param → HTTP 400 with errors.lat
+  ✓ Missing lat rejected with errors["lat"] = `lat` is required
+
+AZ-811 rule 4: legacy `?Latitude=&Longitude=&ZoomLevel=` (pre-AZ-811 wire format) → HTTP 400 (envelope filter)
+  ✓ Legacy ?Latitude=&Longitude=&ZoomLevel= rejected by envelope filter
+
+AZ-811 rule 4: hostile/typo query keys → HTTP 400 (envelope filter)
+  ✓ ?debug=1&admin=true rejected; errors map names BOTH unknown keys
+
+AZ-811 rule 5: lat type mismatch (non-numeric) → HTTP 400
+  ✓ lat=fifty rejected with HTTP 400
+✓ GET lat/lon validation tests: PASSED
+```
+
+`=== All tests passed (mode=smoke) ===` — no regressions in cycle-7 inventory/idempotent/security/route/tile/leaflet/migration suites.
+
+## Verdict Logic
+
+- No Critical, no High, no Medium findings.
+- 1 Info finding (F1) — design rationale captured in code + doc; not a regression.
+- **PASS_WITH_NOTES**.

_docs/_autodev_state.md

@@ -6,9 +6,9 @@ step: 10
 name: Implement
 status: in_progress
 sub_step:
-  phase: 0
+  phase: 7
-  name: awaiting-invocation
+  name: batch-loop
-  detail: ""
+  detail: "batch 2 of 4 complete (AZ-808 + AZ-811 In Testing); next: batch 3 = AZ-809 route validator"
 retry_count: 0
 cycle: 8
 tracker: jira

scripts/probe_latlon_validation.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Manual end-to-end probe for GET /api/satellite/tiles/latlon strict validation
+# (AZ-811). Each failure call should return HTTP 400 with an
+# `application/problem+json` body. The happy path should return HTTP 200.
+#
+# Two enforcement layers:
+#   1. RejectUnknownQueryParamsEndpointFilter — rejects any query key outside
+#      {lat, lon, zoom}.
+#   2. WithValidation<GetTileByLatLonQuery> — range-checks lat, lon, zoom.
+#
+# Usage:
+#   API_URL=https://localhost:8080 JWT="<bearer-token>" ./scripts/probe_latlon_validation.sh
+
+API_URL="${API_URL:-https://localhost:8080}"
+JWT="${JWT:-}"
+PATH_LATLON="${API_URL%/}/api/satellite/tiles/latlon"
+
+if [[ -z "${JWT}" ]]; then
+    echo "ERROR: set JWT env var to a bearer token. Mint one via:"
+    echo "  dotnet run --project SatelliteProvider.IntegrationTests -- --mint-only"
+    exit 2
+fi
+
+curl_args=(-sS -k -H "Authorization: Bearer ${JWT}" -X GET)
+
+probe() {
+    local label="$1"
+    local query="$2"
+    local expected_status="$3"
+
+    echo "----- ${label} (expecting HTTP ${expected_status}) -----"
+    local response
+    response=$(curl "${curl_args[@]}" "${PATH_LATLON}?${query}" -w "\nHTTP_STATUS=%{http_code}\n")
+    echo "${response}"
+    local actual_status
+    actual_status=$(echo "${response}" | tail -n 1 | sed 's/HTTP_STATUS=//')
+    if [[ "${actual_status}" != "${expected_status}" ]]; then
+        echo "FAIL: expected HTTP ${expected_status}, got ${actual_status}"
+        return 1
+    fi
+    echo "OK: HTTP ${expected_status}"
+    echo
+}
+
+probe "happy-path"             "lat=47.461747&lon=37.647063&zoom=18"     200
+# Validator rules — NotNull (missing required) + InclusiveBetween (range)
+probe "missing-lat"            "lon=37.647063&zoom=18"                   400
+probe "missing-lon"            "lat=47.461747&zoom=18"                   400
+probe "missing-zoom"           "lat=47.461747&lon=37.647063"             400
+probe "lat-out-of-range"       "lat=91&lon=37.647063&zoom=18"            400
+probe "lon-out-of-range"       "lat=47.461747&lon=181&zoom=18"           400
+probe "zoom-out-of-range"      "lat=47.461747&lon=37.647063&zoom=30"     400
+# Envelope rule: unknown query params (legacy pre-AZ-811 wire names + hostile probes)
+probe "legacy-param-names"     "Latitude=47.461747&Longitude=37.647063&ZoomLevel=18" 400
+probe "hostile-debug-admin"    "lat=47.461747&lon=37.647063&zoom=18&debug=1&admin=true" 400
+probe "typo-zooom"             "lat=47.461747&lon=37.647063&zooom=18"    400
+# Type mismatch (model binder)
+probe "lat-type-mismatch"      "lat=fifty&lon=37.647063&zoom=18"         400
+
+echo "All probes passed."

scripts/probe_region_validation.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Manual end-to-end probe for the region-request endpoint's strict validation
+# gate (AZ-808). Each failure call should return HTTP 400 with an
+# `application/problem+json` body whose `errors` map names the offending field
+# path. The happy path should return HTTP 200.
+#
+# Usage:
+#   API_URL=https://localhost:8080 JWT="<bearer-token>" ./scripts/probe_region_validation.sh
+#   (defaults to https://localhost:8080 with a JWT minted via PerfBootstrap --mint-only)
+
+API_URL="${API_URL:-https://localhost:8080}"
+JWT="${JWT:-}"
+PATH_REGION="${API_URL%/}/api/satellite/request"
+
+if [[ -z "${JWT}" ]]; then
+    echo "ERROR: set JWT env var to a bearer token. Mint one via:"
+    echo "  dotnet run --project SatelliteProvider.IntegrationTests -- --mint-only"
+    exit 2
+fi
+
+curl_args=(-sS -k -H "Authorization: Bearer ${JWT}" -H "Content-Type: application/json" -X POST "${PATH_REGION}")
+
+probe() {
+    local label="$1"
+    local body="$2"
+    local expected_status="$3"
+
+    echo "----- ${label} (expecting HTTP ${expected_status}) -----"
+    local response
+    response=$(curl "${curl_args[@]}" -d "${body}" -w "\nHTTP_STATUS=%{http_code}\n")
+    echo "${response}"
+    local actual_status
+    actual_status=$(echo "${response}" | tail -n 1 | sed 's/HTTP_STATUS=//')
+    if [[ "${actual_status}" != "${expected_status}" ]]; then
+        echo "FAIL: expected HTTP ${expected_status}, got ${actual_status}"
+        return 1
+    fi
+    echo "OK: HTTP ${expected_status}"
+    echo
+}
+
+# Generate a unique guid for the happy path
+HAPPY_ID="$(uuidgen)"
+
+probe "happy-path"             "{\"id\":\"${HAPPY_ID}\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}" 200
+# Reproduces the 2026-05-22 probe that surfaced silent-Guid-coercion (pre-AZ-808)
+probe "missing-id"             '{"lat":49.94,"lon":36.31,"sizeMeters":200,"zoomLevel":18,"stitchTiles":false}' 400
+probe "zero-guid-id"           '{"id":"00000000-0000-0000-0000-000000000000","lat":47.461747,"lon":37.647063,"sizeMeters":200,"zoomLevel":18,"stitchTiles":false}' 400
+probe "missing-lat"            "{\"id\":\"$(uuidgen)\",\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}" 400
+probe "lat-out-of-range"       "{\"id\":\"$(uuidgen)\",\"lat\":91,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}" 400
+probe "missing-lon"            "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}" 400
+probe "lon-out-of-range"       "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"lon\":181,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}" 400
+probe "missing-sizeMeters"     "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"lon\":37.647063,\"zoomLevel\":18,\"stitchTiles\":false}" 400
+probe "sizeMeters-out-of-range" "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":1000000,\"zoomLevel\":18,\"stitchTiles\":false}" 400
+probe "missing-zoomLevel"      "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"stitchTiles\":false}" 400
+probe "zoomLevel-out-of-range" "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":30,\"stitchTiles\":false}" 400
+probe "missing-stitchTiles"    "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18}" 400
+probe "lat-type-mismatch"      "{\"id\":\"$(uuidgen)\",\"lat\":\"fifty\",\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false}" 400
+# Unknown root field — confirms UnmappedMemberHandling.Disallow stays active
+probe "unknown-root-field"     "{\"id\":\"$(uuidgen)\",\"lat\":47.461747,\"lon\":37.647063,\"sizeMeters\":200,\"zoomLevel\":18,\"stitchTiles\":false,\"unknownField\":1}" 400
+
+echo "All probes passed."

scripts/run-performance-tests.sh

@@ -169,7 +169,7 @@ echo "PT-01: Tile Download Latency (cold) (threshold: 30000ms)"
 PT01_LAT="47.461347"
 PT01_LON="37.646663"
 START=$(date +%s%N)
-HTTP_CODE=$(curl "${CURL_OPTS[@]}" -s -o /dev/null -w "%{http_code}" -H "$AUTH_HEADER" "$API_URL/api/satellite/tiles/latlon?Latitude=$PT01_LAT&Longitude=$PT01_LON&ZoomLevel=18")
+HTTP_CODE=$(curl "${CURL_OPTS[@]}" -s -o /dev/null -w "%{http_code}" -H "$AUTH_HEADER" "$API_URL/api/satellite/tiles/latlon?lat=$PT01_LAT&lon=$PT01_LON&zoom=18")
 END=$(date +%s%N)
 ELAPSED_MS=$(( (END - START) / 1000000 ))
 if [[ "$HTTP_CODE" == "200" ]]; then
@@ -182,7 +182,7 @@ fi
 echo ""
 echo "PT-02: Cached Tile Retrieval Latency (threshold: 500ms)"
 START=$(date +%s%N)
-HTTP_CODE=$(curl "${CURL_OPTS[@]}" -s -o /dev/null -w "%{http_code}" -H "$AUTH_HEADER" "$API_URL/api/satellite/tiles/latlon?Latitude=47.461747&Longitude=37.647063&ZoomLevel=18")
+HTTP_CODE=$(curl "${CURL_OPTS[@]}" -s -o /dev/null -w "%{http_code}" -H "$AUTH_HEADER" "$API_URL/api/satellite/tiles/latlon?lat=47.461747&lon=37.647063&zoom=18")
 END=$(date +%s%N)
 ELAPSED_MS=$(( (END - START) / 1000000 ))