[AZ-284] Autodev baseline + testability refactor

Phase A baseline outputs from /autodev (Steps 1-5):
- Problem & solution docs (_docs/00_problem, _docs/01_solution)
- Codebase documentation (_docs/02_document) incl. architecture,
  module-layout, glossary, system-flows, baseline compliance scan
- Test specs (blackbox, performance, resilience, security, resource,
  traceability matrix)
- Test task decomposition (_docs/02_tasks/todo): AZ-285..AZ-290
- Testability refactor (_docs/04_refactoring/01-testability-refactoring):
  - TC-01 Move DownloadedTileInfoV2 + new ExistingTileInfo to Common.DTO
  - TC-02 Replace dead ISatelliteDownloader API with real signatures
  - TC-03 GoogleMapsDownloaderV2 implements ISatelliteDownloader
  - TC-04 TileService depends on ISatelliteDownloader (mockable)
  - TC-05 DI + endpoints use ISatelliteDownloader
- Test runner scripts (scripts/run-tests.sh, run-performance-tests.sh)
- Autodev state pointer (_docs/_autodev_state.md)

Prepares the codebase for AZ-285..AZ-290 unit/integration test work.

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

_docs/02_document/modules/services_tile_service.md

@@ -0,0 +1,45 @@
+# Module: Services/TileService
+
+## Purpose
+Orchestrates tile downloading and persistence. Bridges the downloader (Google Maps) with the tile repository (PostgreSQL), handling cache checks, entity creation, and metadata mapping.
+
+## Public Interface
+
+### TileService (implements ITileService)
+- `DownloadAndStoreTilesAsync(double lat, double lon, double sizeMeters, int zoomLevel, CancellationToken) → Task<List<TileMetadata>>`:
+  1. Queries existing tiles in the region from the repository (filtered to current year's version)
+  2. Calls `GoogleMapsDownloaderV2.GetTilesWithMetadataAsync` with existing tiles to skip
+  3. Creates `TileEntity` for each newly downloaded tile and inserts via repository (upsert)
+  4. Returns combined list of existing + new tile metadata
+- `GetTileAsync(Guid id) → Task<TileMetadata?>`: single tile lookup
+- `GetTilesByRegionAsync(double lat, double lon, double sizeMeters, int zoomLevel) → Task<IEnumerable<TileMetadata>>`: query tiles in a region
+
+## Internal Logic
+- Version is `DateTime.UtcNow.Year` — tiles are considered fresh for the current calendar year
+- `MapToMetadata(TileEntity) → TileMetadata`: entity-to-DTO mapping (static helper)
+- Tile size hardcoded to 256 pixels, image type "jpg"
+- `MapsVersion` formatted as `"downloaded_{date}"`
+
+## Dependencies
+- `GoogleMapsDownloaderV2` (concrete class, not interface)
+- `ITileRepository`
+- `SatelliteProvider.Common.DTO` — GeoPoint, TileMetadata
+- `SatelliteProvider.DataAccess.Models` — TileEntity
+
+## Consumers
+- `RegionService.ProcessRegionAsync` — downloads and retrieves tiles for a region
+
+## Data Models
+Transforms between `TileEntity` (persistence) and `TileMetadata` (DTO).
+
+## Configuration
+None directly; relies on `GoogleMapsDownloaderV2`'s configuration.
+
+## External Integrations
+Indirect: Google Maps (via downloader), PostgreSQL (via repository).
+
+## Security
+None.
+
+## Tests
+No dedicated tests.