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- Lab-script path convention: course scripts live in modules/NN/lab/; copy the one a step needs into tasks-app, then run by bare name (M4/M6/M7/M26 + headers). - tasks.json stays gitignored: M20 verifies via `cli.py list`/`cat tasks.json` (not git diff) and frames runtime state as deliberately ignored; M22 cleanup uses `rm tasks.json`; M10 review-lab gets its own .gitignore. Module 21's lab deliberately ships NO .gitignore (teaching device) — untouched. - Stop running-example command collisions: M5 clear->search, M6 count/clear-> stats/purge, M7 clear/count->wipe/remaining (README + scripts + agent prompts + branch/worktree names). M6 conflict still reproduces on the carried usage line. Closes #7 Closes #10 Closes #11 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT