Night Market Failure Archaeology

This is a reference document, not a runbook. It records every major investigation, dead end, rejected fix, and revert in this repo as symptom, root cause, evidence, status, and lesson, so nobody re-fights a settled battle. For triage of a failure happening right now, use night-market-debugging-playbook. Come here when a proposed change smells like something the repo already tried and rejected.

Jargon used below:

• "py39 hooks": hook scripts run under the host system Python (3.9 floor), while the rest of the repo requires Python 3.12. Enforced by .github/workflows/python39-compat.yml.
• "unbloat": the conserve plugin's dead-code deletion campaign.
• "Stop hook": a Claude Code hook that runs when a session turn ends.
• "settled": the fight is over. Re-opening it requires new evidence and a note in the collective memory, not a hunch.