[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/tests_integration.md

@@ -0,0 +1,45 @@
+# Module: Tests/SatelliteProvider.IntegrationTests
+
+## Purpose
+Console application that runs end-to-end integration tests against a live API instance. Designed to run in Docker alongside the API and PostgreSQL containers.
+
+## Public Interface
+
+### Test Classes
+- `TileTests` — tile download via lat/lon endpoint
+- `RegionTests` — region request → polling → completion flow
+- `BasicRouteTests` — route creation with intermediate points
+- `ComplexRouteTests` — routes with geofencing
+- `ExtendedRouteTests` — routes with `requestMaps: true` and tile ZIP creation
+
+### Supporting Classes
+- `Models.cs` — HTTP response DTOs for deserialization
+- `RouteTestHelpers.cs` — shared utilities (wait-for-completion polling, geofence polygon builders, test data)
+- `Program.cs` — test runner entry point
+
+## Internal Logic
+- Makes HTTP calls to the API at `API_URL` environment variable (default: `http://api:8080`)
+- Tests are methods called sequentially from `Program.cs` (not xUnit — plain console app)
+- Poll-based waiting for async operations (region/route completion)
+- Validates response structure, status transitions, file creation
+
+## Dependencies
+- No project references (standalone console app)
+- Communicates with the API exclusively via HTTP
+- NuGet: implicit .NET 8 runtime
+
+## Consumers
+- `docker-compose.tests.yml` — runs as a container that depends on the API service
+
+## Configuration
+- `API_URL` environment variable (set in docker-compose.tests.yml to `http://api:8080`)
+
+## External Integrations
+- HTTP to the SatelliteProvider API
+- Reads output files from mounted `./ready/` and `./tiles/` volumes
+
+## Security
+None.
+
+## Tests
+This IS the integration test suite.