[AZ-576] Add e2e test infrastructure (xUnit + jwks-mock + reporting)

Scaffold the blackbox test project the rest of epic AZ-575 (AZ-577..AZ-586)
will build on. Two new csprojs under tests/, plus the TLS materials and
TRX->CSV reporting hand-off the existing docker-compose.test.yml already
calls for.

JWKS mock (tests/Azaion.Missions.JwksMock/):
- ASP.NET Core minimal API on .NET 10, no NuGet deps; JWS is hand-rolled
  to keep the surface tight and avoid version drift with the SUT
- KeyStore with one in-memory ECDSA P-256 keypair + retired-key grace
  window for NFT-RES-07 / NFT-SEC-11 rotation observability
- Endpoints: GET /.well-known/jwks.json, POST /sign, POST /rotate-key
- Mock-only alg_override / kid_override switches drive NFT-SEC-09/10/11
- TLS keypair committed under tls/; tests/jwks-mock-ca.crt is a copy
  mounted into both missions and e2e-consumer per docker-compose.test.yml

E2E consumer (tests/Azaion.Missions.E2E.Tests/):
- xUnit 2.9.2 + Bogus 35.6.1 + Npgsql 10.0.2 + Xunit.SkippableFact 1.4.13
- TestBase / TokenMinter scaffolding for downstream tasks
- Fixtures/ for DbReset, DbSeed, ComposeRestart, JwksRotate, JwksMockReverse
- Helpers/ for DbAssertions (side-channel), HttpAssertions, FixtureSql
- 8 Tests/<category>/Sanity.cs discovery smoke tests (AC-3)
- Tests/InfrastructureSanity.cs SkippableFacts for AC-1/2/5/6
- Tests/AaaPatternEnforcement.cs greps source files for AC-7
- Tests/Reporting/TrxToCsvPostProcessorTests.cs covers AC-4
- Reporting/TrxToCsvPostProcessor.cs handles VSTest TRX -> environment.md
  CSV; xUnit traits are not propagated by the TRX logger so the converter
  reflects them out of the test DLL via GetCustomAttributesData
- Reporting.Cli/ is a separate console csproj that links the converter
  source files (test project excludes Reporting.Cli/** from compile)
- Dockerfile + entrypoint.sh wire dotnet test -> trx -> csv inside the
  e2e-consumer container the compose file already references

Local verification: 13 pass, 3 skip (with explicit reasons), 0 fail.
End-to-end TRX->CSV manually verified against environment.md header spec.
Docker stack build is handed off to autodev Step 7 (test-run skill).

Reports under _docs/03_implementation/.
AZ-576 task spec moved to _docs/tasks/done/.

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

tests/Azaion.Missions.JwksMock/Endpoints/SignEndpoint.cs

@@ -0,0 +1,65 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Azaion.Missions.JwksMock.Services;
+
+namespace Azaion.Missions.JwksMock.Endpoints;
+
+public static class SignEndpoint
+{
+    /// <summary>
+    /// <c>POST /sign</c>. Body is a small JSON object documented in
+    /// <c>_docs/02_document/tests/test-data.md § JWKS mock token-minting contract</c>.
+    /// All fields optional; omitted fields fall back to mock defaults.
+    /// </summary>
+    public static async Task<IResult> Handle(HttpContext ctx, TokenSigner signer)
+    {
+        SignBody? body;
+        try
+        {
+            body = await JsonSerializer.DeserializeAsync(
+                ctx.Request.Body,
+                SignBodyContext.Default.SignBody,
+                ctx.RequestAborted);
+        }
+        catch (JsonException ex)
+        {
+            return Results.BadRequest(new { error = "invalid_json", detail = ex.Message });
+        }
+        body ??= new SignBody();
+
+        try
+        {
+            var result = signer.Sign(new SignRequest(
+                Issuer:            body.Iss,
+                Audience:          body.Aud,
+                ExpOffsetSeconds:  body.ExpOffsetSeconds,
+                Permissions:       body.Permissions,
+                Subject:           body.Sub,
+                AlgOverride:       body.AlgOverride,
+                KidOverride:       body.KidOverride));
+            return Results.Json(new SignResponse(result.Token, result.Kid), SignBodyContext.Default.SignResponse);
+        }
+        catch (ArgumentException ex)
+        {
+            return Results.BadRequest(new { error = "invalid_arg", detail = ex.Message });
+        }
+    }
+}
+
+public sealed record SignBody(
+    [property: JsonPropertyName("iss")] string? Iss = null,
+    [property: JsonPropertyName("aud")] string? Aud = null,
+    [property: JsonPropertyName("sub")] string? Sub = null,
+    [property: JsonPropertyName("exp_offset_seconds")] int? ExpOffsetSeconds = null,
+    [property: JsonPropertyName("permissions")] string? Permissions = null,
+    [property: JsonPropertyName("alg_override")] string? AlgOverride = null,
+    [property: JsonPropertyName("kid_override")] string? KidOverride = null);
+
+public sealed record SignResponse(
+    [property: JsonPropertyName("token")] string Token,
+    [property: JsonPropertyName("kid")] string Kid);
+
+[JsonSerializable(typeof(SignBody))]
+[JsonSerializable(typeof(SignResponse))]
+[JsonSourceGenerationOptions(PropertyNamingPolicy = JsonKnownNamingPolicy.SnakeCaseLower)]
+internal sealed partial class SignBodyContext : JsonSerializerContext;