slit 89785378bf feat(costs): Wire up gt costs record to Stop hook ...

Add Claude Code Stop hook that automatically records session costs when
sessions end. The hook calls `gt costs record` which now can derive the
session name from GT_* environment variables (GT_RIG, GT_POLECAT, GT_CREW,
GT_ROLE).

Changes:
- Add deriveSessionName() to infer tmux session name from environment
- Add Stop hook to settings-autonomous.json and settings-interactive.json
- Add unit tests for deriveSessionName function

When a Gas Town session ends, the Stop hook fires and records the session
cost as a bead event. Costs then appear in `gt costs --today` output.

Closes: gt-ntzhc

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-02 18:29:25 -08:00

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