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osmWorkflow/.trellis/tasks/08-25-rc-p3-render-separation/research/debug-probe-evidence.md

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P3 Debug Probe Evidence

Date: 2026-08-26

A temporary, uncommitted compiler registry entry declared debug_probe as a marking layer using the existing road_surface material slot. Its generated GeoJSON reused the compiled road-surface collection only for this wiring test. No host source was changed.

The compiler emitted 13 declared sources. Blender then generated /private/tmp/p3-debug-probe.blend; SCENE_DONE reported "debug_probe": 30. The Blender scene digest contains:

{"name":"Road_debug_probe","vertices":274,"polygons":30}

The temporary registry entry was removed immediately after the proof. The standard v0.2.0 compiler was then rerun to restore the normal 12-source output.