Coordinates and axes
Draft outline
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- Axis definitions: X, Y, Z, and A (what A is).
- Sign conventions and how they map to controller/stage motion.
- Coordinate display and manual entry in ImSwitch.
- Travel limits per axis (see Specifications).

TODO image
Axis diagram overlaid on the machine. Notion sources:
TASK-FR031 displaying and entering X Y Z A coordinates,
TASK-FR032 read out and display current detector position,
TASK-FR008 Homing Y makes coordinates wrong (convention gotcha).