TDD: test written first, failed, then fixed.
Problem: save hook says "saved in background" but MEMPAL_DIR defaults
to empty, so nothing actually mines. Users get no auto-save despite
the hook firing every 15 messages.
Fix: use TRANSCRIPT_PATH (received from Claude Code in the hook's
JSON input) to discover the session directory. Mine that directory
automatically. MEMPAL_DIR is still supported as override but no
longer required.
Also fixed: bare python3 → $(command -v python3) for nohup safety.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Milla J