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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:
```json
{"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.