Bake window: derived note lengths carry exact durations, not ladder rungs — a long take is no longer cut at 384 beats

Hold keeps its picker. Also: one home for the %-fold, duration-ordered Hold travel, and a corrupt tail degrades to absent rather than fabricating one.

src/core/instrument/bake/bake_plan.h

@@ -31,21 +31,25 @@ bool bakeWindowNeedsHold(const SampleData& dialed);
 // The bake's programmed note, DERIVED from the dialed sound at `renderSampleRate` (the rate
 // the bake renders at, which is what the engine's frame counts are consumed against):
 //
-//   Trigger      — note length is nominal (note-off is ignored); the end offset carries the
-//                  whole play span, stretched by the deepest downward Varispeed offset.
+//   Trigger      — the note IS the play span (note-off is ignored anyway), stretched by the
+//                  deepest downward Varispeed offset.
 //   Gate, loop   — `hold` is the note length; the end offset is the release.
 //   Gate, no loop— the read head runs off the source and frees the voice whatever the gate is
-//                  doing, so the note is rounded UP to the shortest programmable length that
-//                  outlasts the source. Holding longer than that sounds identical, which is
-//                  what makes the overshoot trailing silence rather than a different sound.
+//                  doing, so the note is the whole post-start span, stretched the same way.
+//
+// Both derived lengths are EXACT durations, not ladder rungs: a source longer than the
+// ladder's top rung has no rung that covers it, and quantizing up to one overshoots every
+// other source (see note/CLAUDE.md). `hold` alone stays musical — it is a picker.
 //
 // Every case is padded by the voice's terminal declick ramp (kDeclickFrames): trailing
 // silence is free, and closing the window on the frame the ramp starts is a hard cut.
 // `hold` is read only in the Gate-with-loop case; `velocity` is the velocity the note fires
 // at, and it feeds the Varispeed stretch as well as the render.
+//
+// Takes no tempo: nothing derived here is beat-denominated. The one field that is — `hold` —
+// meets the tempo in resolveNote, with the rest of the program's beat-denominated fields.
 note::NoteProgram defaultBakeProgram(const SampleData& dialed, int renderSampleRate,
-                                     note::Tempo tempo, note::Division hold,
-                                     note::Velocity velocity);
+                                     note::Division hold, note::Velocity velocity);
 
 // The render window in frames. TWO domains meet here: `totalFrames` is the captured FILE's
 // length, everything else counts RENDER frames from whichever comes first, note-on or the