docs+src: complete Steps 1-3 outcomes + auth re-sync baseline

This commit captures everything produced during autodev existing-code
Steps 1 (Document), 2 (Architecture Baseline Scan), and 3 (Test Spec),
together with the targeted auth + CORS re-sync triggered on 2026-05-14
when codebase drift was detected at Step 4 entry. None of this work was
previously committed.

Step 1 (Document) — 50+ _docs/02_document/ files: problem, solution,
architecture, system flows, glossary, module-layout, per-component
specs (01..06), modules, deployment, diagrams, data model, FINAL
report, verification log, discovery.

Step 2 (Architecture Baseline) — architecture_compliance_baseline.md.
Verdict PASS_WITH_WARNINGS (0 Critical, 0 High, 1 Medium, 2 Low). No
High/Critical findings; auto-chained to Step 3 per existing-code flow.

Step 3 (Test Spec) — _docs/02_document/tests/* (67 scenarios across
blackbox, security, resilience, resource-limit, performance), plus
e2e/docker-compose.test.yml, e2e/seed/run.sh, scripts/run-tests.sh,
scripts/run-performance-tests.sh. Coverage 88% over the active scope
(40 of 45 items covered, 6 RB-deferred, 5 documented-as-uncovered).

Targeted auth + CORS re-sync — replaces the deleted in-house token
issuer with a JWKS-verifier model. AuthController and TokenService
removed; JwtExtensions switched from HS256 symmetric to ES256 over
admin's JWKS. ConfigurationResolver and CorsConfigurationValidator
added under src/Infrastructure/. ADR-002 and ADR-006 retired; SEC-01,
SEC-02, SEC-03 marked Closed. One new testability risk recorded in
architecture.md Open Risks Section 6 (JWKS HTTPS gating).

Source changes:
- src/Auth/JwtExtensions.cs (modified) — ES256, JWKS, alg pinning
- src/Program.cs (modified) — DI wiring for ConfigurationResolver
  and CorsConfigurationValidator
- src/Controllers/AuthController.cs (deleted) — no in-service issuance
- src/Services/TokenService.cs (deleted) — same
- src/Infrastructure/ConfigurationResolver.cs (new)
- src/Infrastructure/CorsConfigurationValidator.cs (new)
- .env.example (new) — required env var documentation
- .gitignore (updated)

Cross-repo coordination: _docs/cross-repo/flights_h1_h2_h3_change_spec
captures the change-spec for downstream services that consumed the now
deleted /auth endpoints.

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

_docs/02_document/modules/README.md

@@ -0,0 +1,19 @@
+# Module documentation index
+
+Modules follow **`suite/_docs/01_annotations.md`**: annotations vs media, SSE, auth/JWT refresh, DB, RabbitMQ sync, plus **dataset** (DATASET) and **settings / detection classes** as implemented in this repo.
+
+| Order | File | Scope |
+|------:|------|--------|
+| 1 | [wire-enums.md](./wire-enums.md) | `src/Enums/*` |
+| 2 | [database-layer.md](./database-layer.md) | `src/Database/*` |
+| 3 | [common-infrastructure.md](./common-infrastructure.md) | `PathResolver`, `ErrorHandlingMiddleware`, shared small types |
+| 4 | [auth-identity.md](./auth-identity.md) | `JwtExtensions` (JWKS verifier), `ConfigurationResolver`, `CorsConfigurationValidator` |
+| 5 | [media-service.md](./media-service.md) | `MediaService`, `MediaController`, media DTOs |
+| 6 | [annotations-service.md](./annotations-service.md) | `AnnotationService`, `AnnotationsController` (REST + files) |
+| 7 | [dataset-service.md](./dataset-service.md) | `DatasetService`, `DatasetController`, dataset DTOs |
+| 8 | [settings-metadata-service.md](./settings-metadata-service.md) | `SettingsService`, `SettingsController`, `ClassesController`, settings DTOs |
+| 9 | [sse-realtime.md](./sse-realtime.md) | `AnnotationEventService`, SSE endpoint |
+| 10 | [rabbitmq-stream-sync.md](./rabbitmq-stream-sync.md) | `FailsafeProducer`, `RabbitMqConfig`, `QueueMessages` |
+| 11 | [composition-program.md](./composition-program.md) | `Program.cs` |
+
+`src/DTOs/` types are described in the module that exposes them on the wire.