Electron-based instrument interface and `OptikaInstrument` - #18

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feature/electron-based-instruments

Commits on Jul 30, 2026

Add electron-based instrument interface and `LinearOptikaInstrument`

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Rename to `OptikaInstrument` and generalize the instrument tests

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Apply read noise once per readout in the instruments

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Test that read noise is applied once per readout

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Use pixel-coordinate distortion in the OptikaInstrument fixture

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Add a `unit` parameter to `backproject` to match the scene units

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Use `SpectralPositionalVectorArray.volume_cell` in `_volume_scene`

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Remove accidentally-committed scratch files

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