Add unit tests for Router configuration and transport layers

- Implemented tests for RouterConfig, RoutingOptions, StaticInstanceConfig, and RouterConfigOptions to ensure default values are set correctly.
- Added tests for RouterConfigProvider to validate configurations and ensure defaults are returned when no file is specified.
- Created tests for ConfigValidationResult to check success and error scenarios.
- Developed tests for ServiceCollectionExtensions to verify service registration for RouterConfig.
- Introduced UdpTransportTests to validate serialization, connection, request-response, and error handling in UDP transport.
- Added scripts for signing authority gaps and hashing DevPortal SDK snippets.

docs/modules/excititor/TASKS.md

@@ -5,7 +5,8 @@
 | EXCITOR-DOCS-0001 | DONE (2025-11-07) | Docs Guild | README aligned to consensus beta release notes. |
 | EXCITOR-OPS-0001 | DONE (2025-11-07) | Ops Guild | Runbooks/observability checklist added (`mirrors.md`). |
 | EXCITOR-ENG-0001 | DONE (2025-11-07) | Module Team | Implementation plan alignment with SPRINT_200 updates. |
-| EXCITITOR-DOCS-0001 | BLOCKED (2025-11-19) | Docs Guild | Await chunk API CI validation + OpenAPI freeze before finalizing docs. |
+| EXCITITOR-DOCS-0001 | BLOCKED (2025-11-19) | Docs Guild | Await chunk API CI validation + OpenAPI freeze before finalizing docs; gate defined in `OPENAPI_FREEZE_CHECKLIST.md`. |
+| EXCITITOR-API-STUBS | DONE (2025-12-05) | Docs Guild | Prepared `docs/modules/excititor/api/` stub with `SHA256SUMS` and `samples/` for chunk API freeze; ready to record hashes when spec lands. |
 | EXCITITOR-ENG-0001 | BLOCKED (2025-12-03) | Module Team | Blocked by EXCITITOR-DOCS-0001 (chunk API CI/OpenAPI freeze). |
 | EXCITITOR-OPS-0001 | BLOCKED (2025-12-03) | Ops Guild | Blocked by EXCITITOR-DOCS-0001; update runbooks once OpenAPI freezes. |