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.

docs/implplan/SPRINT_325_docs_modules_policy.md

@@ -7,6 +7,8 @@ Depends on: Sprint 100.A - Attestor, Sprint 110.A - AdvisoryAI, Sprint 120.A - A
 Summary: Documentation & Process focus on Docs Modules Policy).
 Task ID | State | Task description | Owners (Source)
 --- | --- | --- | ---
-POLICY ENGINE-DOCS-0001 | TODO | See ./AGENTS.md | Docs Guild (docs/modules/policy/TASKS.md)
-POLICY ENGINE-ENG-0001 | TODO | Update status via ./AGENTS.md workflow | Module Team (docs/modules/policy/TASKS.md)
-POLICY ENGINE-OPS-0001 | TODO | Sync outcomes back to ../../TASKS.md | Ops Guild (docs/modules/policy/TASKS.md)
+POLICY-READINESS-0001 | TODO | Capture policy module readiness checklist aligned with current sprint goals. | Policy Guild (docs/modules/policy)
+POLICY-READINESS-0002 | TODO | Track outstanding prerequisites/risk items for policy releases and mirror into sprint updates. | Policy Guild (docs/modules/policy)
+POLICY ENGINE-DOCS-0001 | TODO | See ./AGENTS.md | Docs Guild (docs/modules/policy)
+POLICY ENGINE-ENG-0001 | TODO | Update status via ./AGENTS.md workflow | Module Team (docs/modules/policy)
+POLICY ENGINE-OPS-0001 | TODO | Sync outcomes back to ../.. | Ops Guild (docs/modules/policy)