fix: harden adaptive audio resume and release

src/audio/adaptive-mixer.ts

@@ -141,12 +141,13 @@ export const createAdaptiveMixer: AdaptiveMixerFactory = (context, destination)
       liftPhase === 'off' ||
       liftPhase === 'exiting'
     ) return;
+    const entryWillComplete = liftPhase === 'entering';
     scheduledStart = nextBeatTime(
       now + LIFT_EXIT_DWELL_SECONDS,
       transportAnchor,
     );
     scheduledEnd = scheduledStart + MUSIC_BEAT_SECONDS;
-    holdParameter(driveLiftGate.gain, now);
+    if (!entryWillComplete) holdParameter(driveLiftGate.gain, now);
     driveLiftGate.gain.setValueAtTime(1, scheduledStart);
     driveLiftGate.gain.linearRampToValueAtTime(0, scheduledEnd);
     liftPhase = 'exiting';

src/audio/soundtrack-engine.ts

@@ -499,8 +499,8 @@ export function createSoundtrackEngine(
     async resume() {
       if (closed) throw new DOMException('Audio graph is closed.', 'InvalidStateError');
       await context.resume();
-      ensureDriveLiftLoad();
       if (transportStarted) return;
+      ensureDriveLiftLoad();
       loadPromise ??= loadAndStart();
       await loadPromise;
     },