feat: add terminology schema example and improve schema-list command

This commit completes Phase 2 of schema evolution work and establishes
a new example demonstrating schema usage for terminology documents.

## New Features

### Terminology Validation Example (examples/terminology/)
- Complete example terminology document with proper structure
- JSON schema with MarkiTect extensions for validation
- Demonstrates schema usage beyond manpages (glossaries, lexicons)
- Validates term structure: Definition, Synonyms, Related Terms, Examples
- Includes content control and quality validation rules
- Full documentation with usage examples and best practices

### Schema Registration System
- Registered terminology schema in markitect database
- Created schema catalog (markitect/schemas/schema-catalog.yaml)
- Copied schema to official location (markitect/schemas/)
- Provides metadata, features, and usage info for all schemas

### Improved schema-list Command
- Now displays creation timestamps in default output
- Table format includes Created/Updated columns
- Cleaner timestamp formatting (removed microseconds)
- Better visibility into when schemas were added

## Files Changed

Added:
- examples/terminology/README.md - Complete documentation
- examples/terminology/terminology-example.md - Example glossary
- examples/terminology/terminology-schema.json - Validation schema
- markitect/schemas/terminology-schema.json - Registered schema
- markitect/schemas/schema-catalog.yaml - Schema registry

Modified:
- markitect/cli.py - Enhanced schema-list with timestamps
- TODO.md - Documented Phase 2 completion and new example

Moved:
- SCHEMA_EVOLUTION_WORKPLAN.md → todo/ directory

## Schema Features Demonstrated

- Heading hierarchy validation (H1 → H2 → H3)
- Term structure validation with required/optional fields
- Content quality metrics (word counts, readability targets)
- MarkiTect extensions (x-markitect-sections, x-markitect-content-control)
- Classification system (required/recommended/optional/discouraged/improper)

## Usage

```bash
# List schemas with timestamps
markitect schema-list

# Validate terminology document
markitect validate glossary.md --schema terminology-schema.json

# View in table format
markitect schema-list --format table
```

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

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

TODO.md

@@ -76,7 +76,7 @@ The **capability-capability** includes:
 
 *Recent completed tasks have been documented in _issue-tracking/issue-facade/CHANGELOG.md following Keep a Changelog format.*
 
-### 2026-01-04 - Phase 2: Schema Refinement Tools
+### 2026-01-04 - Phase 2: Schema Refinement Tools & Terminology Example
 - ✅ Implemented schema-analyze command to detect rigidity issues
 - ✅ Implemented schema-refine command with automatic loosening logic
 - ✅ Added interactive mode to schema-refine for fine-grained control
@@ -84,6 +84,8 @@ The **capability-capability** includes:
 - ✅ Wrote user guide documentation with examples and workflows
 - ✅ Successfully tested on example schemas (reduced rigidity from 60/100 to 24/100)
 - ✅ Integrated into CLI with proper exit codes and error handling
+- ✅ Moved SCHEMA_EVOLUTION_WORKPLAN.md to todo/ directory
+- ✅ Created terminology validation example (examples/terminology/)
 
 **Key Features Delivered:**
 - Rigidity score calculation (0-100 scale)
@@ -93,6 +95,14 @@ The **capability-capability** includes:
 - Interactive approval workflow
 - Comprehensive reporting (normal and verbose modes)
 
+**Terminology Example:**
+- Complete terminology document structure (terminology-example.md)
+- JSON schema with MarkiTect extensions (terminology-schema.json)
+- Demonstrates schema usage for non-manpage documents
+- Validates term definitions, synonyms, related terms, examples
+- Includes content control and validation rules
+- Full documentation and usage examples (README.md)
+
 ### 2025-12-17 - Architecture Refactoring
 - ✅ Implemented ReusableCapabilitiesArchitecture v0.1
 - ✅ Added feedback capability to issue-facade