docs: close out Ξ-W1-T1, Ξ-W1-T2 and Θ-W3-T1 into COMPLETED; map the note directory; document the Release build

src/core/instrument/CLAUDE.md

@@ -1,8 +1,8 @@
-# src/core/instrument — pure VST3-instrument core (engine / map / ui)
+# src/core/instrument — pure VST3-instrument core (engine / map / note / ui)
 
 ## Scope
 
-The ReaSampler 9000 instrument's pure, REAPER-free, VST3-free, unit-tested core, in three
+The ReaSampler 9000 instrument's pure, REAPER-free, VST3-free, unit-tested core, in four
 subdirectories:
 
 - **`engine/`** — the polyphonic voice engine, the one set of play params, pitch shifting,
@@ -11,6 +11,9 @@ subdirectories:
   `ComponentState` codec, and the small pure helpers the engine/shell share
   (bank-generation sync, bridge-read marshalling, note-name parsing, Trigger
   frame↔fraction conversion).
+- **`note/`** — the programmed capture-signal model: musical-division note length, tempo
+  resolution, and anchored start/end offsets — the one record and resolver a
+  capture-signal popup and the offline bake read from, so they cannot diverge.
 - **`ui/`** — pure editor geometry/hit-test modules (the band-stack allocator and its band
   interiors, waveform, keyboard strip, capture browser, param controls, envelope
   overlay/edit). These are geometry-and-math only; the LICE draw + REAPER/VST3 plumbing is