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/Scanner/StellaOps.Scanner.Sbomer.BuildXPlugin/TASKS.md

@@ -1,7 +0,0 @@
-# BuildX Plugin Task Board (Sprint 9)
-
-| ID | Status | Owner(s) | Depends on | Description | Exit Criteria |
-|----|--------|----------|------------|-------------|---------------|
-| SCANNER-SURFACE-03 | DONE (2025-11-07) | BuildX Plugin Guild | SURFACE-FS-02 | Push layer manifests and entry fragments into Surface.FS during build-time SBOM generation.<br>2025-11-06: Kicked off manifest emitter wiring within BuildX export pipeline and outlined test fixtures targeting Surface.FS client mock.<br>2025-11-07: Resumed work; reviewing Surface.FS models, CAS integration, and test harness approach before coding.<br>2025-11-07 22:10Z: Implemented Surface manifest writer + CLI plumbing, wired CAS persistence, documented the workflow, and added BuildX plug-in tests + Grafana fixture updates. | BuildX integration tests confirm cache population; CLI docs updated. |
-| SCANNER-ENV-03 | TODO | BuildX Plugin Guild | SURFACE-ENV-02 | Adopt Surface.Env helpers for plugin configuration (cache roots, CAS endpoints, feature toggles). | Plugin loads helper; misconfig errors logged; README updated. |
-| SCANNER-SECRETS-03 | TODO | BuildX Plugin Guild, Security Guild | SURFACE-SECRETS-02 | Use Surface.Secrets to retrieve registry credentials when interacting with CAS/referrers. | Secrets retrieved via shared library; e2e tests cover rotation; operations guide refreshed. |