feat: Add documentation and task tracking for Sprints 508 to 514 in Ops & Offline

- Created detailed markdown files for Sprints 508 (Ops Offline Kit), 509 (Samples), 510 (AirGap), 511 (Api), 512 (Bench), 513 (Provenance), and 514 (Sovereign Crypto Enablement) outlining tasks, dependencies, and owners.
- Introduced a comprehensive Reachability Evidence Delivery Guide to streamline the reachability signal process.
- Implemented unit tests for Advisory AI to block known injection patterns and redact secrets.
- Added AuthoritySenderConstraintHelper to manage sender constraints in OpenIddict transactions.

docs/implplan/SPRINT_214_web_iii.md

@@ -0,0 +1,24 @@
+# Sprint 214 - Experience & SDKs · 180.F) Web.III
+
+Active items only. Completed/historic work now resides in docs/implplan/archived_sprints_tasks.md (updated 2025-11-08).
+
+[Experience & SDKs] 180.F) Web.III
+Depends on: Sprint 180.F - Web.II
+Summary: Experience & SDKs focus on Web (phase III).
+Task ID | State | Task description | Owners (Source)
+--- | --- | --- | ---
+WEB-LNM-21-003 `Policy evidence aggregation` | TODO | Provide combined endpoint for Console to fetch policy result + source evidence (advisory + VEX linksets) for a component. Dependencies: WEB-LNM-21-002. | BE-Base Platform Guild, Policy Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-NOTIFY-38-001 `Gateway routing` | TODO | Route notifier APIs (`/notifications/*`) and WS feed through gateway with tenant scoping, viewer/operator scope enforcement, and SSE/WebSocket bridging. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-NOTIFY-39-001 `Digest & simulation endpoints` | TODO | Surface digest scheduling, quiet-hour/throttle management, and simulation APIs; ensure rate limits and audit logging. Dependencies: WEB-NOTIFY-38-001. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-NOTIFY-40-001 `Escalations & localization` | TODO | Expose escalation, localization, channel health, and ack verification endpoints with admin scope enforcement and signed token validation. Dependencies: WEB-NOTIFY-39-001. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OAS-61-001 `Discovery endpoint` | TODO | Implement `GET /.well-known/openapi` returning gateway spec with version metadata, cache headers, and signed ETag. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OAS-61-002 `Standard error envelope` | TODO | Migrate gateway errors to standard envelope and update examples; ensure telemetry logs include `error.code`. Dependencies: WEB-OAS-61-001. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OAS-62-001 `Pagination & idempotency alignment` | TODO | Normalize all endpoints to cursor pagination, expose `Idempotency-Key` support, and document rate-limit headers. Dependencies: WEB-OAS-61-002. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OAS-63-001 `Deprecation support` | TODO | Add deprecation header middleware, Sunset link emission, and observability metrics for deprecated routes. Dependencies: WEB-OAS-62-001. | BE-Base Platform Guild, API Governance Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OBS-50-001 `Telemetry core adoption` | TODO | Integrate `StellaOps.Telemetry.Core` into gateway host, replace ad-hoc logging, ensure all routes emit trace/span IDs, tenant context, and scrubbed payload previews. | BE-Base Platform Guild, Observability Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OBS-51-001 `Observability health endpoints` | TODO | Implement `/obs/health` and `/obs/slo` aggregations, pulling metrics from Prometheus/collector APIs, including burn-rate signals and exemplar links for Console widgets. Dependencies: WEB-OBS-50-001. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OBS-52-001 `Trace & log proxies` | TODO | Deliver `/obs/trace/:id` and `/obs/logs` proxy endpoints with guardrails (time window limits, tenant scoping) forwarding to timeline indexer + log store with signed URLs. Dependencies: WEB-OBS-51-001. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OBS-54-001 `Evidence & attestation bridges` | TODO | Provide `/evidence/*` and `/attestations/*` pass-through endpoints, enforce `timeline:read`, `evidence:read`, `attest:read` scopes, append provenance headers, and surface verification summaries. Dependencies: WEB-OBS-52-001. | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OBS-55-001 `Incident mode controls` | TODO | Add `/obs/incident-mode` API (enable/disable/status) with audit trail, sampling override, retention bump preview, and CLI/Console hooks. Dependencies: WEB-OBS-54-001. | BE-Base Platform Guild, Ops Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-OBS-56-001 `Sealed status surfaces` | TODO | Extend telemetry core integration to expose sealed/unsealed status APIs, drift metrics, and Console widgets without leaking sealed-mode secrets. Dependencies: WEB-OBS-55-001. | BE-Base Platform Guild, AirGap Guild (src/Web/StellaOps.Web/TASKS.md)
+WEB-ORCH-32-001 `Read-only routing` | TODO | Expose `/orchestrator/sources | BE-Base Platform Guild (src/Web/StellaOps.Web/TASKS.md)