Ξ-W2-T1 remediation: print master gain into the bake, derive the window from the dialed sound, reset play mode to Trigger

src/core/wire/sample_usage.h

@@ -11,11 +11,11 @@
 // decisions (what to write on publish, which records count at prune time) are
 // pure and provable without a DAW; shells only move strings.
 //
-// The INSTRUMENT writes usage keys, the EXTENSION only reads them — the one
-// sanctioned instrument->ext-state write. It does not weaken the
-// read-only-bank invariant: the instrument publishes only its own
-// per-instance key, never banks/view/tail/assign; the bridge's write entry
-// point structurally accepts only "rsusage_"-prefixed keys.
+// The INSTRUMENT writes usage keys, the EXTENSION only reads them — one of the
+// two sanctioned instrument->ext-state writes (bake_wire's request key is the
+// other). It does not weaken the read-only-bank invariant: the instrument
+// publishes only its own per-instance key, never banks/view/tail/assign; the
+// bridge's write entry point structurally accepts only "rsusage_"-prefixed keys.
 //
 // Every failure, ambiguity, or uncertainty here fails safe toward PROTECT (the
 // territory-wide asymmetry, stated in core/tracking/CLAUDE.md). Three folds enforce