`OpentronsOT2Backend`: validate head8 pickup geometry against the Opentrons API#1136

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PyLabRobot:mainfrom

BioCam:ot2-head8-pickup-guard

Commits on Jun 29, 2026

`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

`OpentronsOT2ChatterboxBackend`: dry-run the OT-2 backend via the transport seam

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`OpentronsOT2ChatterboxBackend`: tests + differential audit vs the simulator

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Log OT-2 HTTP calls at LOG_LEVEL_IO, like other backends' io

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`OpentronsOT2Backend`: model a multi mount as 8 channels (head8 step 1)

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`OpentronsOT2Backend`: one command per column for multi ops (head8 step 2)

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Audit OT-2 tests: drop redundant/weak cases and tautological asserts

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`OpentronsOT2Backend`: head8 partial-pickup geometry guard (head8 step 3)

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