feat: daybreak finale turns the contact arrival into a sunrise with a dawn chord

src/audio/adaptive-mixer.ts

@@ -27,6 +27,8 @@ export interface AdaptiveMixer {
   readonly bedInput: GainNode;
   readonly driveLiftInput: GainNode;
   readonly driveTextureInput: GainNode;
+  /** END OF SHIFT: the dawn chord, summed after the mood controls. */
+  readonly dawnInput: GainNode;
   setChapterIntent(intent: ChapterIntent): void;
   setDriveEnergy(sample: DriveEnergySample): void;
   setTransportAnchor(anchorTime: number | null): void;
@@ -57,6 +59,9 @@ export const createAdaptiveMixer: AdaptiveMixerFactory = (context, destination)
   const driveTextureInput = context.createGain();
   const textureSend = context.createGain();
   const sum = context.createGain();
+  // The dawn chord joins the sum directly: the output gain (mute, volume) and
+  // the pulse tap govern it, and the chapter moods leave it alone.
+  const dawnInput = context.createGain();
   const highShelf = context.createBiquadFilter();
 
   const initialProfile = MIX_PROFILES.open;
@@ -77,6 +82,7 @@ export const createAdaptiveMixer: AdaptiveMixerFactory = (context, destination)
   driveLiftCap.connect(sum);
   driveTextureInput.connect(textureSend);
   textureSend.connect(sum);
+  dawnInput.connect(sum);
   sum.connect(destination);
 
   const ownedNodes: readonly AudioNode[] = [
@@ -88,6 +94,7 @@ export const createAdaptiveMixer: AdaptiveMixerFactory = (context, destination)
     driveLiftCap,
     driveTextureInput,
     textureSend,
+    dawnInput,
     sum,
   ];
   let transportAnchor: number | null = null;
@@ -197,6 +204,7 @@ export const createAdaptiveMixer: AdaptiveMixerFactory = (context, destination)
     bedInput,
     driveLiftInput,
     driveTextureInput,
+    dawnInput,
     setChapterIntent(intent) {
       if (disposed) return;
       const profile = MIX_PROFILES[intent.mood];