docs: complete Phase 6 - integration testing and documentation

Completed final phase of Schema-of-Schemas implementation with
comprehensive testing and user documentation.

**Integration Testing:**
- All 97 unit tests passing (50 naming + 35 loader + 12 metaschema)
- End-to-end workflow testing:
  * Schema creation and validation
  * Schema ingestion into registry
  * Numbered schema listing
  * Single schema validation (number, filename, path)
  * Batch validation (ranges, lists, --all)
  * Schema deletion and cleanup

**Documentation:**
- Created comprehensive SCHEMA_MANAGEMENT_GUIDE.md
- Quick start guide with templates
- Complete command reference for all schema commands
- Common workflows and use cases
- Best practices and troubleshooting
- Advanced usage patterns
- Future enhancement notes

**Phase Summary:**
- Schema-of-Schemas implementation complete (6 phases)
- Fully functional schema management system
- 97 tests with 100% pass rate
- 4 comprehensive documentation files:
  * SCHEMA_MANAGEMENT_GUIDE.md (usage)
  * SCHEMA_NAMING_SPEC.md (naming conventions)
  * SCHEMA_LOADER_GUIDE.md (markdown schemas)
  * schema-schema-v1.0.md (metaschema reference)

This completes the Schema-of-Schemas implementation, providing a
robust, well-tested, and well-documented schema management system
for MarkiTect.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

TODO.md

@@ -67,10 +67,17 @@ This section is for tasks currently being discussed with or worked on by the cod
 - [x] Test all selection methods (1, 1-3, 1,3,5, all, filename, ./path)
 - [x] Maintain backward compatibility with single-file validation
 
-**Next Phase:**
-- Phase 6: Integration testing and final documentation (1 day)
+**Phase 6 Tasks (Completed ✅):**
+- [x] Run complete test suite - all 97 tests passing (50 naming + 35 loader + 12 metaschema)
+- [x] Perform end-to-end integration testing of complete schema workflow
+- [x] Test schema creation, validation, ingestion, listing, and batch operations
+- [x] Create comprehensive usage documentation (SCHEMA_MANAGEMENT_GUIDE.md)
+- [x] Document all commands, workflows, and best practices
+- [x] Verify no regressions in existing functionality
 
-**Expected Completion:** 1 day remaining
+**Schema-of-Schemas Implementation: COMPLETE ✅**
+
+All 6 phases completed successfully. The schema management system is fully functional with comprehensive testing and documentation.
 
 ---
 
@@ -136,6 +143,29 @@ The **capability-capability** includes:
 
 *Recent completed tasks have been documented in _issue-tracking/issue-facade/CHANGELOG.md following Keep a Changelog format.*
 
+### 2026-01-05 - Phase 6: Integration Testing and Final Documentation
+- ✅ Ran complete test suite - all 97 tests passing (50 naming + 35 loader + 12 metaschema)
+- ✅ Performed end-to-end integration testing:
+  - Schema creation and validation
+  - Schema ingestion into registry
+  - Numbered schema listing
+  - Single schema validation (by number, filename, path)
+  - Batch validation (ranges, lists, --all)
+  - Schema deletion
+- ✅ Created comprehensive SCHEMA_MANAGEMENT_GUIDE.md with:
+  - Quick start guide and templates
+  - Complete command reference
+  - Common workflows and examples
+  - Best practices and troubleshooting
+  - Advanced usage patterns
+
+**Schema-of-Schemas Implementation Complete:**
+- 6 phases completed over 2 days
+- 97 unit tests (100% passing)
+- End-to-end integration verified
+- Comprehensive documentation delivered
+- Fully functional schema management system
+
 ### 2026-01-05 - Phase 5: Enhanced Schema Validation with Multiple Selection
 - ✅ Enhanced schema-list command with numbered references in all formats
 - ✅ Implemented schema selection parser supporting: