[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/04_verification_log.md

@@ -0,0 +1,60 @@
+# Verification Log
+
+## Summary
+
+| Metric | Count |
+|--------|-------|
+| Code entities verified | 48 |
+| Entities flagged (incorrect) | 1 |
+| Corrections applied | 1 |
+| Remaining gaps | 1 (minor) |
+| Completeness | 16/16 modules documented |
+
+## Corrections Applied
+
+### 1. data_model.md — Removed `stitched_image_path` from regions table
+
+**Issue**: Listed `stitched_image_path` as a column on the `regions` table.
+**Reality**: `RegionEntity` has no such property. Stitched images for regions are generated to disk but the path is only written to the summary text file, not stored as a DB column. `StitchedImagePath` only exists on `RouteEntity`.
+**Fix**: Removed from ERD and table definition in `data_model.md`.
+
+## Entity Verification
+
+All classes, interfaces, and types mentioned in documentation were cross-referenced against the codebase:
+
+- **Entities** (4/4): TileEntity, RegionEntity, RouteEntity, RoutePointEntity ✓
+- **Service interfaces** (5/5): ITileService, IRegionService, IRouteService, IRegionRequestQueue, ISatelliteDownloader ✓
+- **Service implementations** (7/7): TileService, RegionService, RouteService, GoogleMapsDownloaderV2, RegionProcessingService, RouteProcessingService, RegionRequestQueue ✓
+- **Repositories** (6/6): ITileRepository, IRegionRepository, IRouteRepository, TileRepository, RegionRepository, RouteRepository ✓
+- **Config classes** (4/4): MapConfig, StorageConfig, ProcessingConfig, DatabaseConfig ✓
+- **DTOs** (10/10): GeoPoint, Direction, TileMetadata, RegionRequest, RegionStatus, RouteResponse, RoutePoint, RoutePointDto, CreateRouteRequest, GeofencePolygon ✓
+- **Utilities** (1/1): GeoUtils ✓
+- **Infrastructure** (1/1): DatabaseMigrator ✓
+
+## Interface Accuracy
+
+All method signatures in component/module docs verified against actual code. No discrepancies found.
+
+## Flow Correctness
+
+- F1 (Single Tile): TileService → TileRepo → GoogleMaps → FileSystem ✓
+- F2 (Region Request): RegionService → RegionRepo → Queue ✓
+- F3 (Region Processing): BackgroundService → TileService → FileSystem → RegionRepo ✓
+- F4 (Route Creation): RouteService → GeoUtils → RouteRepo ✓
+- F5 (Route Map Processing): RouteProcessingService → RegionService → Queue → ZIP ✓
+- F6 (Status Query): Direct DB lookup ✓
+
+## Remaining Gaps (Minor)
+
+1. **Tile serving endpoint**: `GET /tiles/{z}/{x}/{y}` serves raw tile images from disk. Not documented in system-flows as it's a trivial static file serve. Noted in architecture as implicit.
+
+## Consistency Check
+
+- Component docs ↔ Architecture doc: consistent ✓
+- Flow diagrams ↔ Component interfaces: consistent ✓
+- Data model ↔ Migration SQL: consistent (after correction) ✓
+- Module layout ↔ Actual file paths: consistent ✓
+
+## Note on AGENTS.md Discrepancy
+
+The project's `AGENTS.md` mentions `geofence_polygons` as a field on the `routes` table. This is inaccurate — geofence polygons are passed in `CreateRouteRequest` but are NOT persisted on the routes table. Their effects are stored indirectly via `route_regions.is_geofence` and `route_regions.geofence_polygon_index`. The generated documentation correctly omits this non-existent column.