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/engine/voice.cpp

@@ -6,8 +6,6 @@
 
 #include <algorithm>
 
-#include "core/instrument/map/trigger_seam.h"  // effectiveLengthFraction (the one %-length rule)
-
 namespace reasampler {
 
 void Voice::presizePreserveShifters(std::int64_t windowFrames) {
@@ -103,12 +101,13 @@ void Voice::start(int note, int velocity, const SampleData& sample, bool declick
         env_.noteOn();
         playEnd_ = 0;  // unused in Gate
     } else {
-        // Trigger: play [start, playEnd) where playEnd = start + round(frac*(frames-start)).
-        // The spline fold lives in effectiveLengthFraction (trigger_seam.h), which the bake's
-        // window derivation reads too — a second copy of it here is what let a stored-but-inert
-        // %-knob shorten the bake while the voice played the whole take.
-        double frac = instrument::map::effectiveLengthFraction(p);
-        if (frac <= 0.0) frac = 0.0;      // %=0 -> zero play length (finishes immediately)
+        // Trigger: play [start, playEnd) where playEnd = start + round(frac*(frames-start)) —
+        // map/trigger_seam.h's formula, evaluated inline because the engine does not depend on
+        // map/. The spline fold is effectiveLengthFraction (play_params.h); a second copy of it
+        // here is what let a stored-but-inert %-knob shorten the bake while the voice played
+        // the whole take.
+        double frac = effectiveLengthFraction(p);
+        if (!(frac > 0.0)) frac = 0.0;    // %=0 (or a corrupt NaN) -> finishes immediately
         if (frac > 1.0) frac = 1.0;
         std::int64_t playLen = static_cast<std::int64_t>(
             static_cast<double>(postStart) * frac + 0.5);  // round