Harden audio transcription arg hydration and add rewrite audit event

src/daemon/routing.test.ts

@@ -1351,7 +1351,7 @@ describe('daemon audio routing integration', () => {
     expect(String(msg.text)).toContain('audio transcription is not configured');
   });
 
-  it('transcribes voice attachments when transcription is configured, then strips audio before calling agent.process', async () => {
+  it('transcribes voice attachments when transcription is configured and preserves audio for anthropic tool fallback', async () => {
     const processSpy = vi.spyOn(AgentOrchestrator.prototype, 'process').mockResolvedValue('ok');
 
     // Mock transcription endpoint call.
@@ -1422,6 +1422,90 @@ describe('daemon audio routing integration', () => {
       timestamp: Date.now(),
     } as MessageRouterInput, reply);
 
+    expect(fetchSpy).toHaveBeenCalled();
+    expect(processSpy).toHaveBeenCalledTimes(1);
+    const [calledText, calledAttachments] = processSpy.mock.calls[0] ?? [];
+    expect(String(calledText)).toContain('[Voice message]: hello world');
+    expect(String(calledText)).toContain('caption');
+    const atts = calledAttachments as Array<{ mimeType: string }> | undefined;
+    expect(atts?.some(a => a.mimeType === 'audio/ogg')).toBe(true);
+    expect(atts?.some(a => a.mimeType === 'image/jpeg')).toBe(true);
+    expect(session.setConfig).toHaveBeenCalledWith(
+      'lastAudioAttachment',
+      expect.stringContaining('"mimeType":"audio/ogg"'),
+    );
+  });
+
+  it('transcribes voice attachments when transcription is configured and strips audio for openai-compatible providers', async () => {
+    const processSpy = vi.spyOn(AgentOrchestrator.prototype, 'process').mockResolvedValue('ok');
+
+    const fetchSpy = vi.spyOn(globalThis, 'fetch').mockResolvedValue({
+      ok: true,
+      status: 200,
+      statusText: 'OK',
+      json: async () => ({ text: 'hello world' }),
+    } as Response);
+
+    const session = {
+      id: 'telegram:user-voice-3',
+      addMessage: vi.fn(),
+      getHistory: vi.fn(() => []),
+      clear: vi.fn(),
+      replaceHistory: vi.fn(),
+      getConfig: vi.fn(() => undefined),
+      setConfig: vi.fn(),
+      deleteConfig: vi.fn(),
+    };
+
+    const commandRegistry = new CommandRegistry();
+    registerBuiltinCommands(commandRegistry);
+
+    const router = createMessageRouter({
+      sessionManager: { getSession: vi.fn(() => session) } as unknown as MessageRouterDeps['sessionManager'],
+      modelRouter: {
+        getAvailableTiers: () => ['default'],
+        getAllLabels: () => ({ default: 'default' }),
+        getLabel: (tier: string) => tier,
+      } as unknown as MessageRouterDeps['modelRouter'],
+      systemPrompt: 'test prompt',
+      toolRegistry: { clone() { return this; }, register: vi.fn() } as unknown as MessageRouterDeps['toolRegistry'],
+      toolExecutor: {} as unknown as MessageRouterDeps['toolExecutor'],
+      config: {
+        agents: {
+          primary_tier: 'default',
+          delegation: {
+            compaction: 'default',
+            memory_extraction: 'default',
+            classification: 'default',
+            tool_summarisation: 'default',
+            complex_reasoning: 'default',
+          },
+          max_delegation_depth: 1,
+          max_iterations: 3,
+        },
+        compaction: { enabled: false },
+        models: { default: { provider: 'openai', model: 'gpt-4.1', supports_audio: false } },
+        audio: {
+          enabled: true,
+          provider: { type: 'openai', endpoint: 'https://example.com/v1/audio/transcriptions', api_key: 'sk-test', model: 'whisper-1' },
+        },
+      } as unknown as MessageRouterDeps['config'],
+      commandRegistry,
+    });
+
+    const reply = vi.fn(async (_message: OutboundMessage) => {});
+    await router.handler({
+      id: 'v3',
+      channel: 'telegram',
+      senderId: 'user-voice-3',
+      text: 'caption',
+      attachments: [
+        { mimeType: 'audio/ogg', data: 'ZGF0YQ==', filename: 'voice.ogg' },
+        { mimeType: 'image/jpeg', data: 'aW1n', filename: 'img.jpg' },
+      ],
+      timestamp: Date.now(),
+    } as MessageRouterInput, reply);
+
     expect(fetchSpy).toHaveBeenCalled();
     expect(processSpy).toHaveBeenCalledTimes(1);
     const [calledText, calledAttachments] = processSpy.mock.calls[0] ?? [];
@@ -1430,6 +1514,10 @@ describe('daemon audio routing integration', () => {
     const atts = calledAttachments as Array<{ mimeType: string }> | undefined;
     expect(atts?.some(a => a.mimeType === 'audio/ogg')).toBe(false);
     expect(atts?.some(a => a.mimeType === 'image/jpeg')).toBe(true);
+    expect(session.setConfig).toHaveBeenCalledWith(
+      'lastAudioAttachment',
+      expect.stringContaining('"mimeType":"audio/ogg"'),
+    );
   });
 });