[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/dataaccess_region_repository.md

@@ -0,0 +1,43 @@
+# Module: DataAccess/Repositories/RegionRepository
+
+## Purpose
+Dapper-based repository for the `regions` table. Tracks region processing requests and their status lifecycle.
+
+## Public Interface
+
+### IRegionRepository (interface)
+- `GetByIdAsync(Guid id) → Task<RegionEntity?>`
+- `GetByStatusAsync(string status) → Task<IEnumerable<RegionEntity>>`: retrieves all regions with a given status, ordered by creation date ASC
+- `InsertAsync(RegionEntity region) → Task<Guid>`
+- `UpdateAsync(RegionEntity region) → Task<int>`
+- `DeleteAsync(Guid id) → Task<int>`
+
+### RegionRepository (implementation)
+Same connection-per-call pattern as TileRepository.
+
+## Internal Logic
+Standard CRUD. `GetByStatusAsync` orders by `created_at ASC` to process oldest requests first.
+
+## Dependencies
+- NuGet: `Dapper`, `Npgsql`
+- `SatelliteProvider.DataAccess.Models.RegionEntity`
+- `Microsoft.Extensions.Logging`
+
+## Consumers
+- `RegionService` — insert on request, update during processing
+- `RouteProcessingService` — reads region records to check status and get CSV paths
+
+## Data Models
+Operates on `RegionEntity`.
+
+## Configuration
+Connection string via constructor.
+
+## External Integrations
+PostgreSQL.
+
+## Security
+None.
+
+## Tests
+No dedicated tests.