[AZ-285] Test infrastructure: scaffold unit test project + fixtures

- Add SatelliteProvider.DataAccess project reference to test csproj
  (enables mocking ITileRepository / IRegionRepository / IRouteRepository)
- Replace DummyTest placeholder with InfrastructureTests covering:
  * All mockable interfaces (ISatelliteDownloader, repos, queue, services)
    can be mocked via Moq
  * TileService can be constructed with mocked dependencies
  * Test coordinate fixtures load with expected values
- Add Fixtures/TestCoordinates.cs with REG-01..REG-03 + ROUTE-01/04/06
  shared test data
- Archive AZ-285 to _docs/02_tasks/done/
- Batch 1 review report: PASS_WITH_WARNINGS (Low/Spec-Gap deferred AC-2,
  Low/Maintainability pre-existing FluentAssertions 8.x license note)

Verification: docker dotnet test run — 4/4 tests pass in 2.35s.
Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/03_implementation/reviews/batch_01_review.md

@@ -0,0 +1,49 @@
+# Code Review Report
+
+**Batch**: 1 — AZ-285 Test Infrastructure
+**Date**: 2026-05-10
+**Verdict**: PASS_WITH_WARNINGS
+
+## Findings
+
+| # | Severity | Category | File:Line | Title |
+|---|----------|----------|-----------|-------|
+| 1 | Low | Spec-Gap | (deferred) | AC-2 (docker-compose tests succeed) deferred to Step 7 |
+| 2 | Low | Maintainability | SatelliteProvider.Tests/SatelliteProvider.Tests.csproj | FluentAssertions 8.x licensing — pre-existing, surfaces in test output |
+
+### Finding Details
+
+**F1: AC-2 deferred to Step 7** (Low / Spec-Gap)
+- Location: out-of-batch
+- Description: AZ-285 AC-2 requires `docker-compose -f docker-compose.yml -f docker-compose.tests.yml up --build --abort-on-container-exit` to succeed. This batch only validates the unit test path via a plain `mcr.microsoft.com/dotnet/sdk:8.0` container. The full compose stack runs against the API + Postgres in Step 7 (Run Tests).
+- Suggestion: Verify in Step 7 by running `scripts/run-tests.sh` (the full path).
+- Task: AZ-285
+
+**F2: FluentAssertions 8.x commercial-use license** (Low / Maintainability)
+- Location: `SatelliteProvider.Tests/SatelliteProvider.Tests.csproj`
+- Description: FluentAssertions 8.x was relicensed under Xceed Community License — free for non-commercial use only. The test runner emits this notice. Version was set pre-autodev; this batch did not introduce it.
+- Suggestion: For commercial-use projects, downgrade to FluentAssertions 7.x or migrate to Shouldly / Verify. Decision belongs to the user (not in scope for AZ-285).
+- Task: pre-existing
+
+## Phase Summary
+
+- **Phase 1 (Context)**: AZ-285 spec loaded, ACs identified.
+- **Phase 2 (Spec compliance)**: AC-1 ✓ (project builds, mocks resolve — verified by `AllMockableInterfaces_CanBeMocked` + `TileService_ConstructsWithMockedDependencies`); AC-3 ✓ (4 tests discovered + executed); AC-2 deferred (F1).
+- **Phase 3 (Quality)**: simple, focused fixtures and smoke tests; no SOLID violations.
+- **Phase 4 (Security)**: no secrets, no injection vectors in test code.
+- **Phase 5 (Performance)**: N/A for test infrastructure.
+- **Phase 6 (Cross-task)**: single task in batch.
+- **Phase 7 (Architecture)**: test project's references (Common, Services, DataAccess) all hit Public APIs; no layering violation; no new cycles.
+
+## Test Run
+
+Container: `mcr.microsoft.com/dotnet/sdk:8.0`
+- Restored: 4 projects
+- Built: 4 projects (Common, DataAccess, Services, Tests)
+- Tests discovered: 4
+- Passed: 4 / 4
+- Total time: 2.35s
+
+## Verdict Logic
+
+No Critical or High findings → PASS_WITH_WARNINGS.