Update AUDIT.md: all SEC findings remediated

- Mark SEC-01 through SEC-12 as fixed with fix descriptions
- Update executive summary to reflect full remediation
- Move original finding descriptions to collapsible section
- Replace remediation priority table with status section

Security: documentation-only change, no code modifications

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/settings.local.json

@@ -11,7 +11,8 @@
       "Bash(sqlite3 /Users/kyle/src/mcias/run/mcias.db \"PRAGMA table_info\\(policy_rules\\);\" 2>&1)",
       "Bash(sqlite3 /Users/kyle/src/mcias/run/mcias.db \"SELECT * FROM schema_version;\" 2>&1; sqlite3 /Users/kyle/src/mcias/run/mcias.db \"SELECT * FROM schema_migrations;\" 2>&1)",
       "Bash(go run:*)",
-      "Bash(go list:*)"
+      "Bash(go list:*)",
+      "Bash(go vet:*)"
     ]
   },
   "hooks": {