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ScottW514
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The rule that a rapid after an M5 ships no FIRE is the host's (laser stream rule 16). What only the machine shows is LASER_ON staying off with FIRE clear while the chain can fire; kernel.fire-line's dark sample runs with the chain unarmed. laser.m5-rapid-dark held that sample in a test of its own, with its own arm and press. The emission witness, which every campaign runs, now holds it. - The square ends at M5 with no program end, so the window stays open. - The dark point: the LASER_ON count reads 0 after the M5, the window still armed, and the SoC lock line released (laser_locked false: the engine's armed flag can read true after the latch has locked, and a dark reading with the latch locked is the unarmed case). All three are checked before anything else is sent. - Only then is the rapid sent: G0 X20, a 2.5 s dwell, G0 X-20, a 0.5 s dwell, the program end. Sending it after the dark point keeps the mid-square dwell's own zero from being taken for the dark point. - The test samples until the window closes (a dwell reports Idle, so Idle cannot end it), with the controller's machine X beside each sample. - Every sample from the dark point until the window closes reads no emission, and the HV current stays at its idle reading (HV_DARK_MAX); the reports show the head out at +20 mm and back at the start inside that stretch, and the latch reads released on the sample at +20 mm. - The square still has to show emission and an HV rise, judged on the samples before the M5; the beam detector is judged there too. - The job-based disarm is timed from the head being back: under 10 s, where the idle grace is 60 s. - The rapid's list and its sampler live inside the test, and the deletion takes only m5-rapid-dark's own lines (decorator through body), so laser.py's shared text is byte-for-byte unchanged. - live_fire_drills.py's m5dark note and the bench README say the emission witness now carries the drill's check. Proof: the fingerprint parts of laser.py before and after: the shared text unchanged, every other test's own text unchanged. In the controller, glowforge_laser.c keeps the latch unlocked from the job's first laser-on through M5/M3 toggles and relocks it at program end or after the laser_disarm_s spindle-off grace (60 s by default), so the dark point and the rapid fall inside the window. The coverage lint reports 0 uncovered paths over 110 tests (its one failure is setup.check-lens's src/lensfind.* entry, which the forgectrl pin bump clears); pyflakes adds no finding; the forgetest host suite passes under Linux. Acceptance: only laser.emission-witness moves, and as an always-required test it must pass on the bench in the next campaign before a release can inherit its PASS.