forensic-deepdive-extract

Run a full forensic deep-dive on an unfamiliar codebase, producing five durable markdown artifacts (MAP.md, HOTPATHS.md, ARCHAEOLOGY.md, MENTAL_MODEL.md, AGENT_BRIEF.md). Use when the user says "analyze this repo", "onboard me to X", "I just joined a new team", "deep-dive this codebase", or clones/opens a repo they haven't worked in before. Do NOT use if the repo already has fresh artifacts under docs/codebase/ less…