Creates and maintains PROJECT.md — the project facts file at the project root. Identity, site, zoning, program, and code facts, each entry with a source and date, plus an index of decision records.
/project-dossier → status
/project-dossier init → create, with a short interview
/project-dossier update → reconcile with new facts from the conversation
Facts only. Rationale goes in decision records — see /decision.
Analysis skills across the marketplace read the dossier before fetching and append findings after completing; this skill owns init, updates, and file hygiene.