feat: MCP server — AI agents call parsec as a tool

[erishforG]

Vision (v1.0: AI agent Git interface)

AI agents (Claude Code, Cursor, VS Code Copilot) call parsec directly as an MCP tool to autonomously perform ticket→PR→merge workflows.

Proposal

Run parsec as an MCP (Model Context Protocol) server:

parsec mcp serve    # start MCP server

Exposed tools

Tool	Description
`parsec_start`	Create worktree from ticket
`parsec_list`	List active worktrees
`parsec_ship`	Push + PR + cleanup
`parsec_ci`	Check CI status
`parsec_merge`	Merge PR
`parsec_conflicts`	Cross-worktree conflict detection
`parsec_board`	Sprint board query
`parsec_status`	Workspace status

Leverages existing strengths

• `--json` output already structured — reuse as MCP responses
• Error codes (E001-E013) let agents precisely identify failures
• `doctor --ai` rules embedded in MCP server description

Reference

GitButler: `but mcp` — exposes `gitbutler_update_branches` tool

Milestone

v1.0