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ScottW514
b2c42f0cc3
The post-run pass compared the kernel position counters exactly, so a test that put the head back within a hundredth of a millimeter failed whenever that distance did not round to the same step. motion.lid-cancel-home found it on the bench reference. The test cancels a job with the lid twice and the controller returns the head to the job start each time, landing 0.038 and 0.037 mm out - the same figures as the run before it, which passed. This time the two returns left four steps on X, 0.075 mm at 53.333 steps per mm, and the hand-back called it a leftover. Twenty-three runs of that test, all passing, on returns of the same accuracy: whether the residue rounds to zero is chance, not a property of the machine or of the test. A difference inside POSITION_DEADBAND_MM (0.1 mm, five steps at x8) on X and Y is now the quantization rather than a leftover. The head is still put back, so nothing accumulates over a campaign - only the failure goes. Z stays exact: the return never moves the lens, so a Z difference is still a leftover and still unrestorable. Host-proven: four new unit tests on the boundary (four steps and a moved Z on either side of it, and an unreadable reading), and the forgetest suite.