Initial public release of GPT Repo MCP

Includes:

• local-first ChatGPT MCP server for approved repositories
• read-only repo inspection, search, and bounded file reads
• git status, diff, and review workflows
• opt-in safe file writes and edit packs
• local stage, commit, recover, and cleanup workflows
• ChatGPT handoff notes
• Codex task prompt/review workflow
• ngrok and Secure MCP Tunnel setup docs
• fresh-clone starter config fix