stress (round 3, snapshot10d): 5/5 pass.
h1 4 CLIs same project+HOME: 4 sessions, shared writes.jsonl 5 clean lines, snapshots match, no locks left. h2 12 CLIs in 13 s, all exit 0, 12 sessions, no 429 (rate-limit path not exercised). h3 8 CLIs, all node --test pass (11..32 each), no cross-talk. h4 resume race: r1 took the lock, r2 refused at once ("open in another G-Code process (pid …)"), exit 1 by design, save intact (4 messages). h5 5 messages in one ms ran strictly in order, files correct.
Note: scenarios.json lists medium/low for h1-h3/h5; everything ran at High by the user's choice.
