Add LDAP Distinguished Name Helper and Credential Audit Context

- Implemented LdapDistinguishedNameHelper for escaping RDN and filter values.
- Created AuthorityCredentialAuditContext and IAuthorityCredentialAuditContextAccessor for managing credential audit context.
- Developed StandardCredentialAuditLogger with tests for success, failure, and lockout events.
- Introduced AuthorityAuditSink for persisting audit records with structured logging.
- Added CryptoPro related classes for certificate resolution and signing operations.

src/Policy/StellaOps.Policy.Registry/TASKS.md

@@ -1,17 +0,0 @@
-# Policy Registry Task Board — Epic 4: Policy Studio
-| ID | Status | Owner(s) | Depends on | Description | Exit Criteria |
-|----|--------|----------|------------|-------------|---------------|
-| REGISTRY-API-27-001 | TODO | Policy Registry Guild | AUTH-CONSOLE-23-001, POLICY-ENGINE-20-001 | Define OpenAPI specification covering workspaces, versions, reviews, simulations, promotions, and attestations; publish typed clients for Console/CLI. | OpenAPI YAML committed, spectral lint passes, SDK regeneration documented, consumers notified. Docs `DOCS-POLICY-27-001/008/010` waiting on this spec. |
-| REGISTRY-API-27-002 | TODO | Policy Registry Guild | REGISTRY-API-27-001 | Implement workspace storage (Mongo collections, object storage buckets) with CRUD endpoints, diff history, and retention policies. | Workspace CRUD passes integration tests; retention job documented; tenancy scopes enforced. |
-| REGISTRY-API-27-003 | TODO | Policy Registry Guild | REGISTRY-API-27-002, POLICY-ENGINE-20-001 | Integrate compile endpoint: forward source bundle to Policy Engine, persist diagnostics, symbol table, rule index, and complexity metrics. | Compile API returns diagnostics + symbol table, metrics recorded, failures mapped to `ERR_POL_*`, tests cover success/error cases. |
-| REGISTRY-API-27-004 | TODO | Policy Registry Guild | REGISTRY-API-27-003, POLICY-ENGINE-20-002 | Implement quick simulation API with request limits (sample size, timeouts), returning counts, heatmap, sampled explains. | Quick sim enforces limits, results cached with hash, integration tests validate deterministic output. |
-| REGISTRY-API-27-005 | TODO | Policy Registry Guild, Scheduler Guild | REGISTRY-API-27-004, SCHED-WORKER-27-301 | Build batch simulation orchestration: enqueue shards, collect partials, reduce deltas, produce evidence bundles + signed manifest. | Batch sim runs end-to-end in staging fixture, manifests stored with checksums, retries/backoff documented. |
-> Docs dependency: `DOCS-POLICY-27-004` needs simulation APIs/workers.
-| REGISTRY-API-27-006 | TODO | Policy Registry Guild | REGISTRY-API-27-003 | Implement review workflow (comments, votes, required approvers, status transitions) with audit trails and webhooks. | Review endpoints enforce approver quorum, audit log captured, webhook integration tests pass. |
-> Docs dependency: `DOCS-POLICY-27-005` waiting on review workflow.
-| REGISTRY-API-27-007 | TODO | Policy Registry Guild, Security Guild | REGISTRY-API-27-006, AUTH-POLICY-27-001 | Implement publish pipeline: sign source/compiled digests, create attestations, mark version immutable, emit events. | Published versions immutable, attestations stored & verifiable, metrics/logs emitted, tests cover signing failure. |
-> Docs dependency: `DOCS-POLICY-27-003` blocked until publish/sign pipeline ships.
-| REGISTRY-API-27-008 | TODO | Policy Registry Guild | REGISTRY-API-27-007, AUTH-POLICY-27-002 | Implement promotion bindings per tenant/environment with canary subsets, rollback path, and environment history. | Promotion API updates bindings atomically, canary percent enforced, rollback recorded, runbooks updated. |
-> Docs dependency: `DOCS-POLICY-27-006` requires promotion APIs.
-| REGISTRY-API-27-009 | TODO | Policy Registry Guild, Observability Guild | REGISTRY-API-27-002..008 | Instrument metrics/logs/traces (compile time, diagnostics rate, sim queue depth, approval latency) and expose dashboards. | Metrics registered, dashboards seeded, alerts configured, documentation updated. |
-| REGISTRY-API-27-010 | TODO | Policy Registry Guild, QA Guild | REGISTRY-API-27-002..008 | Build unit/integration/load test suites for compile/sim/review/publish/promote flows; provide seeded fixtures for CI. | Tests run in CI, load test report documented, determinism checks validated across runs. |