stress (Haiku rerun on snapshot10c, Opus 5.5/High reviewer): 5/5 pass, 0 product defects.
h1 4 drivers on one project and one HOME: no lost writes, ledgers add up; h2 12-way burst in 13 s, no cross-talk, no 429; h3 8 modules, all tests pass; h4 the second resume was refused cleanly with "open in another G-Code process (pid …)", no clobbering, no stale lock; h5 5 rapid messages ran in order with bypass/high controls applied.
Note: scenarios.json lists medium/low for h1–h3 and h5, but by the user's choice everything except g8/g9 ran at High.
