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Oleksandr Shyshatskyi
8cd284d3ee
_guarded snapshots the pins on entry and _restore puts back what it found, which is right for every value except one. If a run ever ends with the latch still on, the next run snapshots 1.00, faithfully restores 1.00, and the drivers stay dead -- one aborted run turning into a printer that relatches itself on every subsequent run. Release the latch instead of reinstating it; only a non-latched value is worth restoring truthfully. Also correct an overstatement in the previous commit. A klippy or MCU shutdown does NOT leave the drivers latched: [output_pin] hands shutdown_value, which defaults to 0., to setup_start_value, so the MCU drives PH2/PH3 low by itself. The guard earns its keep on the ordinary failures -- a command_error, a cancel, an exception out of the sweep -- which unwind through _restore with the machine still running. The latched and released values are named rather than spelled 1.00 and 0.00 at four call sites, since the comparison in the snapshot now depends on them agreeing.
