feat: Add in-memory implementations for issuer audit, key, repository, and trust management

- Introduced InMemoryIssuerAuditSink to retain audit entries for testing.
- Implemented InMemoryIssuerKeyRepository for deterministic key storage.
- Created InMemoryIssuerRepository to manage issuer records in memory.
- Added InMemoryIssuerTrustRepository for managing issuer trust overrides.
- Each repository utilizes concurrent collections for thread-safe operations.
- Enhanced deprecation tracking with a comprehensive YAML schema for API governance.

.claude/settings.local.json

@@ -27,7 +27,8 @@
       "Bash(if not exist \"E:\\dev\\git.stella-ops.org\\src\\Scanner\\__Tests\\StellaOps.Scanner.Analyzers.Lang.Java.Tests\\Internal\" mkdir \"E:\\dev\\git.stella-ops.org\\src\\Scanner\\__Tests\\StellaOps.Scanner.Analyzers.Lang.Java.Tests\\Internal\")",
       "Bash(if not exist \"E:\\dev\\git.stella-ops.org\\src\\Scanner\\__Tests\\StellaOps.Scanner.Analyzers.Lang.Node.Tests\\Internal\" mkdir \"E:\\dev\\git.stella-ops.org\\src\\Scanner\\__Tests\\StellaOps.Scanner.Analyzers.Lang.Node.Tests\\Internal\")",
       "Bash(rm:*)",
-      "Bash(if not exist \"C:\\dev\\New folder\\git.stella-ops.org\\docs\\implplan\\archived\" mkdir \"C:\\dev\\New folder\\git.stella-ops.org\\docs\\implplan\\archived\")"
+      "Bash(if not exist \"C:\\dev\\New folder\\git.stella-ops.org\\docs\\implplan\\archived\" mkdir \"C:\\dev\\New folder\\git.stella-ops.org\\docs\\implplan\\archived\")",
+      "Bash(del \"C:\\dev\\New folder\\git.stella-ops.org\\docs\\implplan\\SPRINT_0510_0001_0001_airgap.md\")"
     ],
     "deny": [],
     "ask": []