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/CLAUDE.md

@@ -35,11 +35,13 @@ decision about what the render made obsolete.
   source exhaustion, since the read head frees the voice whether or not the gate is down.
   `bakeWindowNeedsHold` is the predicate, and it reads the ENGINE's loop fold rather than the
   loop fields, so the control that collects Hold cannot appear for a loop the voice refuses.
-- **Trailing silence is free; truncation is not.** Every derivation rounds outward — the Gate
-  note rounds UP to a programmable length that outlasts the source, the Varispeed bound takes
-  the deepest reachable offset, and every path is padded by the voice's terminal declick ramp
-  (`kDeclickFrames`, unconditionally — not branched on the pitch engine that has the ramp
-  today). Judge any change to this module against that asymmetry.
+- **Trailing silence is free; truncation is not.** Every derivation errs outward — the
+  Varispeed bound takes the deepest reachable offset the voice can play, and every path is
+  padded by the voice's terminal declick ramp (`kDeclickFrames`, unconditionally — not branched
+  on the pitch engine that has the ramp today). Judge any change to this module against that
+  asymmetry. What it does NOT mean is quantizing: a derived length is an exact duration and a
+  finite ladder cannot express one (`note/CLAUDE.md`) — rounding up to a rung truncated any
+  source past the top rung, which is the failure this asymmetry exists to prevent.
 - **The reset's survive list is written out; everything else defaults.** `resetAfterBake`
   starts from a default-constructed parameter set and copies back only the mapping facts.
   A parameter added later therefore resets by default — the safe direction, since