`OpentronsOT2Backend`: head8 motion-safety guards - reachability and collision#1134

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PyLabRobot:mainfrom

BioCam:ot2-visualizer-slots

Commits on Jun 29, 2026

`OT2RobotGeometry`: add static OT-2 geometry with per-mount reach checks

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`OTDeck`: model slots as resource holders, inset onto the plate corner

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`OTDeck`: type the slot-holder reassignment so mypy passes

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`OTDeck`: narrow `slots[i]` (Resource | None) in the round-trip test so mypy passes

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`OpentronsOT2Backend`: pin home/stop/modules/trash-drop wire calls

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`OpentronsOT2Backend`: route all ot_api I/O through a self._ot handle

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Commits on Jun 30, 2026