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b0bacdd00b
Introduces a plugin capability that runs Python at the seams of Print::process(), letting a plugin read and rewrite slicing state as it is computed. - New slicing_pipeline_plugin config option; selected plugin refs are serialized into the print manifest. - Print gains an injectable hook fired at each pipeline step (posSlice, posPerimeters, posInfill, ...). It is a no-op when unset, fires only on genuine (re)computation, and never on the use-cache path. - orca.slicing submodule: SlicingPipelineCapabilityBase plus a trampoline and a Step enum. Capabilities read the live graph through zero-copy int64 numpy views (contour/holes geometry with unscaled coordinates, flattened toolpath data) and edit it through 2D-geometry mutators with cache-invariant refresh. - GUI dispatcher runs capabilities during slicing under the GIL, turns plugin errors into slicing errors, honors cancellation, and adds the plugin picker. - Ships the InsetEverySlice sample plugin and binding/hook tests.