gaia-trace-timeline

Audit and repair Gaia user-tree timelines so every skill's current rank is explained by a chain of Hero's Journey events. Trigger this skill when: a contributor's profile chart shows a stale rank (e.g. still shows 3★ after a demotion to 1★); someone asks to "trace what happened" to a skill's rank; validate_timelines.py is failing in CI; you need to backfill missing demote or rank_up events before cutting a release; a skill was reclassified or Star-Bar-reset and the user tree was never updated; or any time the registry node and user tree disagree on a skill's current level. Uses scripts/trace_timeline.py (dry-run + apply) and scripts/validate_timelines.py (CI gate). Do NOT hand-edit timeline[] arrays — the script synthesises properly labelled events with previousValue/newValue so the rank chart plots correctly.