Add MCP server that exposes core CLI commands as tools:
- core_go_test: Run Go tests with filter and coverage options
- core_dev_health: Check development environment health
- core_dev_commit: Create commits with message and repo selection
Returns structured JSON responses for AI agent consumption.
Migrated from core-claude PR #56.
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
