Features:
- Tool 6: tsc_list_missing_patches with universal & Windows modes
- Universal patch report (all OS + third-party software)
- Windows KB-specific summary with MS bulletin support
- 21/21 tests passing
- Mypy 100% clean (31 errors → 0 errors, zero behavioral changes)
- Docker deployment verified with v1.3.1 code

Documentation:
- USER_GUIDE.md Section 8 with comprehensive examples
- HANDOFF.md updated with Tool 7 specification
- TOOLS_ROADMAP.md cleaned up (pending tools only)
- README.md features table updated

Technical:
- 74 universal filters
- 240s cache TTL for patch data
- HTML unescaping and regex parsing
- Token efficiency: 3,000-5,000 tokens

This release enables patch gap analysis across entire infrastructure
with KB article tracking and third-party software monitoring.