chore: establish schema-of-schemas workplan and reorganize roadmap

This commit sets up the comprehensive workplan for implementing a
markdown-first schema management system with naming conventions,
versioning, and self-validation capabilities.

## Directory Reorganization

- Renamed `todo/` → `roadmap/` for better organization
- Created `roadmap/schema-of-schemas/` subdirectory
- Moved schema management planning artifacts to dedicated directory

## Planning Artifacts Created

### Workplan & Documentation
- **WORKPLAN.md** (19KB) - Comprehensive 6-phase implementation plan
- **SCHEMA_MANAGEMENT_PROPOSAL.md** - Full analysis with 4 options
- **SCHEMA_MANAGEMENT_SUMMARY.md** - Executive summary
- **README.md** - Quick reference guide

### Example Schema
- **examples/schemas/manpage-schema-v1.md** - Demonstrates markdown format

## Schema Management System Design

### Naming Convention
**Format:** `{domain}-schema-v{major}.{minor}.md`
**Examples:**
- `manpage-schema-v1.0.md`
- `terminology-schema-v1.0.md`
- `api-documentation-schema-v1.0.md`

### Markdown-First Format
Schemas will be markdown files with:
- YAML frontmatter for metadata
- Rich documentation sections
- Embedded JSON schema in code block
- Version history and examples

### Implementation Phases (8-10 days)

**Phase 0:** Planning & Setup ✅ (0.5 days) - COMPLETE
**Phase 1:** Filename Convention (1 day) - NEXT
**Phase 2:** Markdown Loader (2-3 days)
**Phase 3:** Schema-for-Schemas (2 days)
**Phase 4:** Schema Migration (1-2 days)
**Phase 5:** CLI & Documentation (1 day)
**Phase 6:** Testing & Validation (1 day)

### Goals

1. ✅ Establish naming convention
2. ⏳ Implement filename validation
3. ⏳ Create markdown schema loader
4. ⏳ Build schema-for-schemas metaschema
5. ⏳ Migrate 5 existing schemas (remove 2 duplicates)
6. ⏳ Update CLI and documentation

## Updated Tracking

### TODO.md
- Added Schema-of-Schemas as active work item
- Documented Phase 1 tasks and timeline
- Paused capability extraction work

### CHANGELOG.md
- Added schema management system to [Unreleased]
- Documented directory reorganization
- Added "In Progress" section for current work

## Next Steps

Begin Phase 1:
1. Implement schema_naming.py with validation
2. Add unit tests
3. Update CLI schema-ingest command
4. Create naming specification document

## Files Changed

- CHANGELOG.md - Added unreleased schema management features
- TODO.md - Updated active work tracking
- roadmap/ - Reorganized from todo/
- roadmap/schema-of-schemas/ - New planning directory
- examples/schemas/ - Example markdown schema

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

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

CHANGELOG.md

@@ -8,9 +8,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+- **Schema Management System**: Comprehensive schema management infrastructure with naming conventions and versioning
+  - Naming convention: `{domain}-schema-v{major}.{minor}.md` for all schemas
+  - Markdown-first schema format with embedded JSON (documentation + schema in one file)
+  - Schema catalog (`markitect/schemas/schema-catalog.yaml`) for metadata and discovery
+  - Terminology validation example (`examples/terminology/`) demonstrating schema usage beyond manpages
+  - Schema-for-schemas workplan in `roadmap/schema-of-schemas/` directory
+- **Enhanced schema-list Command**: Now displays creation timestamps in all output formats
+  - Default format shows timestamps inline: `schema-name.json (added: 2026-01-04T23:01:19)`
+  - Table format includes Created/Updated columns
+  - Cleaner timestamp formatting (removed microseconds)
 - Enhanced control panel UI with better resize handle positioning for improved user interaction
 
 ### Changed
+- **Directory Reorganization**: Renamed `todo/` → `roadmap/` for better organization of planning documents
+  - Created `roadmap/schema-of-schemas/` subdirectory for schema management planning artifacts
+  - Moved schema management proposals and workplan to dedicated directory
 - Refactored contents control architecture to use base class pattern properly for better code organization
 - Updated all file references and paths to point to single source of truth in capabilities/testdrive-jsui/js/controls/ directory
 
@@ -21,6 +34,13 @@ 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 1 of 6)
+  - Implementing filename validation for schema naming convention
+  - Building markdown schema loader to parse `.md` schema files
+  - Creating schema-for-schemas metaschema for schema validation
+  - Planning migration of 5 existing schemas to new format (will remove 2 duplicates)
+
 ## [0.9.0] - 2025-11-14
 
 ### Added