refactor: split soundtrack chapter and drive commands

tests/unit/audio-lifecycle.test.ts

@@ -3,7 +3,7 @@ import { createAudioController } from '@/audio/create-audio-controller';
 import type {
   AudioGraph,
   AudioGraphFactory,
-  AudioJourneyState,
+  AudioInitialState,
 } from '@/audio/types';
 
 describe('audio controller lifecycle', () => {
@@ -196,25 +196,49 @@ describe('audio controller lifecycle', () => {
     expect(controller.snapshot().kind).toBe('failed');
   });
 
-  it('stores the latest semantic state before activation and forwards raw clamped updates', async () => {
+  it('stores and normalizes chapter and drive independently before activation', async () => {
     const harness = createHarness();
     const controller = createAudioController({ createGraph: harness.createGraph });
+    controller.setChapterIntent({
+      sectionId: 'contact',
+      mood: 'resolve',
+      atStart: false,
+      entryPhrase: 99,
+      generation: -3,
+    });
+    controller.setDriveEnergy({ energy: 2, source: 'navigation' });
 
-    controller.setJourneyState({ atStart: false, bias: 'resolve', entryPhrase: 7, intensity: 2 });
     expect(harness.constructed).toBe(0);
     await controller.startFromGesture();
+    expect(harness.initialStates).toEqual([{
+      chapter: {
+        sectionId: 'contact',
+        mood: 'resolve',
+        atStart: false,
+        entryPhrase: 7,
+        generation: 0,
+      },
+      drive: { energy: 1, source: 'navigation' },
+    }]);
 
-    expect(harness.initialStates).toEqual([
-      { atStart: false, bias: 'resolve', entryPhrase: 7, intensity: 1 },
-    ]);
-
-    controller.setJourneyState({ atStart: false, bias: 'shadow', entryPhrase: 2, intensity: 0.73 });
-
-    expect(harness.graph.setJourneyState).toHaveBeenLastCalledWith({
+    controller.setChapterIntent({
+      sectionId: 'experience',
+      mood: 'shadow',
       atStart: false,
-      bias: 'shadow',
       entryPhrase: 2,
-      intensity: 0.73,
+      generation: 4,
+    });
+    controller.setDriveEnergy({ energy: 0.73, source: 'physical' });
+    expect(harness.graph.setChapterIntent).toHaveBeenLastCalledWith({
+      sectionId: 'experience',
+      mood: 'shadow',
+      atStart: false,
+      entryPhrase: 2,
+      generation: 4,
+    });
+    expect(harness.graph.setDriveEnergy).toHaveBeenLastCalledWith({
+      energy: 0.73,
+      source: 'physical',
     });
   });
 });
@@ -245,7 +269,8 @@ function createHarness(options: HarnessOptions = {}) {
     connectOutput: vi.fn(),
     disconnectOutput: vi.fn(),
     setOutputGain: vi.fn(),
-    setJourneyState: vi.fn(),
+    setChapterIntent: vi.fn(),
+    setDriveEnergy: vi.fn(),
     cancelPending: vi.fn(),
     onContextStateChange: vi.fn((listener) => {
       stateListeners.add(listener);
@@ -253,10 +278,10 @@ function createHarness(options: HarnessOptions = {}) {
     }),
   } satisfies AudioGraph;
   let constructed = 0;
-  const initialStates: AudioJourneyState[] = [];
-  const createGraph: AudioGraphFactory = (initialState?: AudioJourneyState) => {
+  const initialStates: AudioInitialState[] = [];
+  const createGraph: AudioGraphFactory = (initialState: AudioInitialState) => {
     constructed += 1;
-    if (initialState) initialStates.push(initialState);
+    initialStates.push(initialState);
     return graph;
   };
   return {