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>

CHANGELOG.md

@@ -47,14 +47,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Removed
 - **BREAKING**: Legacy DocumentControls component from TestDrive JSUI plugin system - all control panel functionality now provided by enhanced control panels (ContentsControl, StatusControl, DebugControl, EditControl) with Reset All button functionality moved to EditControl for better maintainability and elimination of code duplication
 
-### In Progress
-- **Schema-of-Schemas Implementation** (Phase 5 of 6 - Completed ✅)
+### Completed Features
+- **Schema-of-Schemas Implementation** (All 6 Phases Complete ✅)
   - ✅ Phase 1: Filename validation for schema naming convention (`markitect/schema_naming.py`, 50 tests)
   - ✅ Phase 2: Markdown schema loader to parse `.md` schema files (`markitect/schema_loader.py`, 35 tests)
   - ✅ Phase 3: Schema-for-schemas metaschema for schema validation (`schema-schema-v1.0.md`, 12 tests)
   - ✅ Phase 4: Migration of 5 existing schemas to new format (migrated 2, deleted 3 duplicates)
   - ✅ Phase 5: CLI enhancements - numbered schema-list, multi-schema validation with selection methods
-  - ⏳ Phase 6: Integration testing and final documentation
+  - ✅ Phase 6: Integration testing and comprehensive documentation (SCHEMA_MANAGEMENT_GUIDE.md)
+  - **Total Test Coverage**: 97 tests, 100% passing
+  - **Complete Documentation**: Usage guide, naming spec, loader guide, metaschema reference
 
 ## [0.9.0] - 2025-11-14