feat: transform to agent coordination platform with comprehensive documentation

Transform Issue Facade from a universal CLI tool into an agent coordination platform with comprehensive documentation and enhanced capabilities for autonomous coding agents.

Major Changes:
- Complete README rewrite focusing on agent-driven coordination
- New comprehensive documentation (AGENT_INTEGRATION.md, CLAUDE.md, ROADMAP.md)
- Capability integration setup with CAPABILITY.yaml and integration scripts
- Enhanced Makefile with local development targets for easier workflows

Bug Fixes:
- Fix schema initialization using executescript() for multi-line SQL support
- Disable FTS5 triggers due to compatibility issues (documented for future re-enablement)

Features:
- Enhanced CLI list command with full parameter passthrough
- New examples directory with agent integration patterns
- New comprehensive test suite (test_core_models.py, test_local_backend.py)

Code Quality:
- Remove @cached_property decorators for Label properties (simplification)
- Clean up test organization (removed old test_gitea_integration.py)

This milestone establishes Issue Facade as a production-ready coordination layer for multi-agent software development, with clear integration paths and comprehensive developer documentation.

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

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

issue_tracker/backends/local/schema.sql

@@ -160,30 +160,10 @@ LEFT JOIN issue_assignees ia ON i.id = ia.issue_id
 LEFT JOIN users u ON ia.user_id = u.id
 GROUP BY i.id, i.number, i.title, i.state, i.created_at, i.updated_at, i.closed_at, m.title;
 
--- Full-text search setup (if SQLite supports FTS)
-CREATE VIRTUAL TABLE IF NOT EXISTS issue_search USING fts5(
-    issue_id,
-    title,
-    description,
-    labels,
-    content='issues'
-);
-
--- Trigger to keep FTS index updated
-CREATE TRIGGER IF NOT EXISTS issue_search_insert AFTER INSERT ON issues
-BEGIN
-    INSERT INTO issue_search(issue_id, title, description)
-    VALUES (NEW.id, NEW.title, NEW.description);
-END;
-
-CREATE TRIGGER IF NOT EXISTS issue_search_update AFTER UPDATE ON issues
-BEGIN
-    UPDATE issue_search
-    SET title = NEW.title, description = NEW.description
-    WHERE issue_id = NEW.id;
-END;
-
-CREATE TRIGGER IF NOT EXISTS issue_search_delete AFTER DELETE ON issues
-BEGIN
-    DELETE FROM issue_search WHERE issue_id = OLD.id;
-END;
+-- Full-text search setup (optional - disabled for now due to compatibility issues)
+-- Can be enabled later by creating FTS5 virtual table manually
+-- CREATE VIRTUAL TABLE IF NOT EXISTS issue_search USING fts5(
+--     issue_id UNINDEXED,
+--     title,
+--     description
+-- );