lab_apply_rhythm

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Compute the sequence's clip durations from the project's cutting preset and — when the tempo allows it — pull the cut points onto the measured beat grid. WRITES the timeline; costs nothing. The old duration of every changed clip is kept in `clip.metadata.dauer_vorher`, so one undo step exists (a second differing run overwrites it — there is no history). Clip count is never changed: no clip is added or removed. SNAPPING IS NOT GUARANTEED, AND A REFUSAL TO SNAP IS A RESULT, NOT A FAILURE — read `gerastet` and `raster.grund` before you repeat anything: 'tempo_unverlaesslich' = measured below the confidence threshold (deliberate; pass trotz_unsicherem_tempo to override), 'nicht_gemessen' = run lab_beatgrid first, 'keine_musikspur'/'musikspur_nicht_aufgeloest' = run lab_bind_audio first, 'rhythmus_ohne_raster' = the preset's rhythm is 'frei' or 'atmend', which means not snapping IS the promise ('auf den Beat', 'auf die Songstruktur' and 'gegen den Takt' are the three that snap), 'toleranz_null' = you passed toleranz_s 0. In every one of those cases the durations are still recomputed from the preset and written — that alone is the difference between 40 and 6 cuts over 30 seconds. Also read `raster.getroffen` of `raster.von`: `gerastet: true` only says snapping ran; this pair says whether it landed. And `geklemmt` lists clips the renderer's own duration clamp moved back OFF the grid.