feat: Complete project readiness audit

- Full static analysis of all 33 Swift source files
- Identified 2 Blockers in IYmtgTests.swift (ScannerViewModel init mismatch, missing property forwards)
- Identified 1 Critical issue: IYmtg_Builder_Mac is empty, cards.json cannot be generated
- Documented 4 Major issues: deprecated onChange API, missing FirebaseCore import, Firebase delete data leak, dead batchUpdatePrices function
- Updated claude_review_summary.md with complete findings by severity
- Added Project Audit section to README.md with link to summary

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -771,3 +771,22 @@ Perform these steps before submitting to the App Store.
 
 ---
 **Version Authority:** 1.0.0
+
+---
+
+## Project Audit
+
+**Audit Date:** 2026-03-05 | **Auditor:** Claude (Sonnet 4.6)
+
+A full compilation-readiness audit was performed against all 33 Swift source files in `IYmtg_App_iOS/`. See [`claude_review_summary.md`](claude_review_summary.md) for the complete report.
+
+**Key findings:**
+
+| Severity | Count | Description |
+|---|---|---|
+| Blocker | 2 | `IYmtgTests.swift` — test target will not compile (`ScannerViewModel()` no-arg init removed; test accesses non-existent VM properties) |
+| Critical | 1 | `IYmtg_Builder_Mac/` is empty — `cards.json` cannot be generated; scanner is non-functional at runtime |
+| Major | 4 | Deprecated `.onChange(of:)` API (iOS 17); missing `import FirebaseCore` in `ModelManager.swift`; Firebase delete data leak; dead `batchUpdatePrices()` function |
+| Minor | 4 | Empty `Features/CardDetail/` directory; `PersistenceActor.swift` placeholder; production `AppConfig` values not set; OTA model restart not documented |
+
+**Overall:** App source code is architecturally complete. Fix the 2 Blocker issues in `IYmtgTests.swift` and implement `IYmtg_Builder_Mac` before developer handoff.