PM

Project-management chat skill that coordinates parallel spawn chats through a shared PM inbox. The PM chat never does the work, it maintains a state file (`<workspace>/.scratch/pm-state.md`), keeps the overview, and hands work out as dispatch prompts written to disk; spawn chats do the actual work and report back through the inbox. Measurable facts (branch, worktrees, inbox backlog, file size, board state) are stamped by bundled scripts instead of written by hand. Use when the user says "box <project>", a bare "box", "/pm", "status [project]", "recap", "what's next?", "where are we on [project]?", "pm status", or pastes a report from a spawn chat. NOT for deep issue think…