Refactor and enhance LDAP plugin configuration and validation

- Updated `LdapPluginOptions` to enforce TLS and client certificate requirements.
- Added validation checks for TLS configuration in `LdapPluginOptionsTests`.
- Improved error handling in `DirectoryServicesLdapConnectionFactory` for StartTLS negotiation.
- Enhanced logging in `LdapCredentialStore` to include detailed audit properties for credential verification.
- Introduced `StubStructuredRetriever` and `StubVectorRetriever` for testing in `ToolsetServiceCollectionExtensionsTests`.
- Refactored `AdvisoryGuardrailPipelineTests` to improve test clarity and structure.
- Added `FileSystemAdvisoryTaskQueueTests` for testing queue functionality.
- Updated JSON test data for consistency with new requirements.
- Modified `AdvisoryPipelineOrchestratorTests` to reflect changes in metadata keys.

src/AdvisoryAI/StellaOps.AdvisoryAI/TASKS.md

@@ -8,8 +8,8 @@
 | AIAI-31-004A | DOING (2025-11-04) | Advisory AI Guild, Platform Guild | AIAI-31-004, AIAI-31-002 | Wire `AdvisoryPipelineOrchestrator` into WebService/Worker, expose API/queue contracts, emit metrics, and stand up cache stub. | API returns plan metadata; worker executes queue message; metrics recorded; doc updated. |
 | AIAI-31-004B | TODO | Advisory AI Guild, Security Guild | AIAI-31-004A, DOCS-AIAI-31-003, AUTH-AIAI-31-004 | Implement prompt assembler, guardrail plumbing, cache persistence, DSSE provenance; add golden outputs. | Deterministic outputs cached; guardrails enforced; tests cover prompt assembly + caching. |
 | AIAI-31-004C | TODO | Advisory AI Guild, CLI Guild, Docs Guild | AIAI-31-004B, CLI-AIAI-31-003 | Deliver CLI `stella advise run <task>` command, renderers, documentation updates, and CLI golden tests. | CLI command produces deterministic output; docs published; smoke run recorded. |
-| AIAI-31-005 | TODO | Advisory AI Guild, Security Guild | AIAI-31-004 | Implement guardrails (redaction, injection defense, output validation, citation enforcement) and fail-safe handling. | Guardrails block adversarial inputs; output validator enforces schemas; security tests pass. |
-| AIAI-31-006 | TODO | Advisory AI Guild | AIAI-31-004..005 | Expose REST API endpoints (`/advisory/ai/*`) with RBAC, rate limits, OpenAPI schemas, and batching support. | Endpoints deployed with schema validation; rate limits enforced; integration tests cover error codes. |
+| AIAI-31-005 | DOING (2025-11-03) | Advisory AI Guild, Security Guild | AIAI-31-004 | Implement guardrails (redaction, injection defense, output validation, citation enforcement) and fail-safe handling. | Guardrails block adversarial inputs; output validator enforces schemas; security tests pass. |
+| AIAI-31-006 | DOING (2025-11-03) | Advisory AI Guild | AIAI-31-004..005 | Expose REST API endpoints (`/advisory/ai/*`) with RBAC, rate limits, OpenAPI schemas, and batching support. | Endpoints deployed with schema validation; rate limits enforced; integration tests cover error codes. |
 | AIAI-31-007 | TODO | Advisory AI Guild, Observability Guild | AIAI-31-004..006 | Instrument metrics (`advisory_ai_latency`, `guardrail_blocks`, `validation_failures`, `citation_coverage`), logs, and traces; publish dashboards/alerts. | Telemetry live; dashboards approved; alerts configured. |
 | AIAI-31-008 | TODO | Advisory AI Guild, DevOps Guild | AIAI-31-006..007 | Package inference on-prem container, remote inference toggle, Helm/Compose manifests, scaling guidance, offline kit instructions. | Deployment docs merged; smoke deploy executed; offline kit updated; feature flags documented. |
 | AIAI-31-010 | DONE (2025-11-02) | Advisory AI Guild | CONCELIER-VULN-29-001, EXCITITOR-VULN-29-001 | Implement Concelier advisory raw document provider mapping CSAF/OSV payloads into structured chunks for retrieval. | Provider resolves content format, preserves metadata, and passes unit tests covering CSAF/OSV cases. |