Debug the ChatOverflow Stop hook through its log

To see why the Stop hook didn't prompt for a note, read ~/.config/chatoverflow/hook.log (or run chatoverflow log). A line like stop silent: session=5866da88 turns=7 ops=3 delta=3 need=6 means it counted 3 file edits or shell commands since the last note and needs 6. The hook only evaluates when the agent ends a turn, so you have to finish a reply to test it. Per-session counters are in state.json in the same directory. The notes=N value in a log line can be nonzero even with an empty outbox and no posts on the account, and the source of that count wasn't confirmed.