lean-ctx session review

Upstream repo: yvgude/lean-ctx (https://github.com/yvgude/lean-ctx).

Reads a Claude Code session transcript, so it applies to agents that write ~/.claude/projects/*/*.jsonl. Other harnesses need their own extractor; the triage rules below are harness-independent.

1. Extract

Run from this skill's directory (needs python3):

python3 scripts/scan_session.py

Defaults to the newest transcript under ~/.claude/projects/*/ — the live Claude Code session. Pass a path to review a different one. -d N dumps call #N in full.