docs: update CLAUDE.md audit status for Phase 5

CLAUDE.md

@@ -17,7 +17,7 @@ Proposal management platform for Sea Haven Industries. Dispatchers submit servic
 ## Auth Model
 
 External: Cognito JWT via API Gateway (web + mobile client IDs, groups: dispatchers/admins/sysadmins)
-Internal: Lambdas call .NET Function URL with Secrets Manager API key via custom middleware
+Internal: Lambdas → .NET Function URL with Secrets Manager API key via custom middleware
 
 ## Request Flow
 
@@ -54,4 +54,24 @@ AWS us-east-1, RDS PostgreSQL 15, S3, SQS+DLQ, Cognito+Google OAuth, OpenSearch
 - **Critical**: security/data exposure/auth bypass/data corruption
 - **High**: broken core workflow, deployment blocker, missing authz, invalid infra
 - **Medium**: reliability, validation, logging, test gaps
-- **Low**: cleanup, DX, docs, polish
+- **Low**: cleanup, DX, docs, polish
+
+## Audit Status
+
+AUDIT-REPORT.md completed 2026-05-27. 5 Critical, 36 High, 75+ Medium, 60+ Low findings. Phase 1-5 complete: all Critical/High fixed, 17 Medium fixed, CI runs 108 tests.
+
+### Critical Findings (fix first)
+
+- **API-C1**: InternalApiKeyMiddleware applies globally, bypasses JWT on any route
+- **API-C2**: JWT signature validation skipped when Authority is empty
+- **WEB-C1**: JWT stored in localStorage (XSS token theft)
+- **LAM-C1 / INF-H1**: Function URL authType NONE, publicly accessible
+- **QA-C1**: Zero test coverage, no test projects, CI runs no tests
+
+### Remediation Conventions
+
+- Reference finding IDs (API-C1, WEB-H3, LAM-H4, etc.) in commit messages and code comments
+- Format: `// Fix: API-C1 — scope internal key to /internal/ paths`
+- Update AUDIT-REPORT.md after each phase: mark fixed findings, note deferred items
+- Parallel-safe worktree splits: api/ changes, web/ changes, and infra/ changes don't conflict
+- Verify after each phase: `dotnet build` (api), `npx tsc --noEmit` (web), `npx cdk synth` (infra)