feat(main): add pipeline orchestrator for auto-transcription

electron/main/main.js

@@ -2,6 +2,9 @@ import { app, BrowserWindow, ipcMain, dialog } from 'electron';
 import { exec } from 'child_process';
 import path from 'path';
 import { fileURLToPath } from 'url';
+// Import audio events and transcription module
+import { audioEvents } from '../../services/modules/extraction/ffmpegExtractor.js';
+import { transcribe } from '../../services/modules/transcription-remote/assembly.js';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -22,7 +25,61 @@ function createWindow() {
   mainWindow.loadFile('main/index.html');
 }
 
-app.whenReady().then(createWindow);
+// Setup pipeline orchestrator
+function setupOrchestrator() {
+  console.log('🎯 [Pipeline] Orchestrator ready. Listening for audio_ready events...');
+  
+  audioEvents.on('audio_ready', async (data) => {
+    const { audioPath, sessionId } = data;
+    
+    console.log(`✅ [Pipeline] Audio ready: ${sessionId}`);
+    
+    // AC6: Send status to UI - Audio bereit
+    mainWindow.webContents.send('pipeline-status', {
+      sessionId,
+      status: 'audio_ready',
+      message: 'Audio bereit'
+    });
+    
+    try {
+      // AC4: Status transcription_started
+      console.log(`🚀 [Pipeline] Starting transcription: ${sessionId}`);
+      mainWindow.webContents.send('pipeline-status', {
+        sessionId,
+        status: 'transcription_started',
+        message: 'Transkription gestartet'
+      });
+      
+      // AC2: Auto-start transcription (S2-02b)
+      await transcribe(audioPath, sessionId);
+      
+      // AC6: Status transcription_completed
+      console.log(`✅ [Pipeline] Transcription completed: ${sessionId}`);
+      mainWindow.webContents.send('pipeline-status', {
+        sessionId,
+        status: 'transcription_completed',
+        message: 'Transkription abgeschlossen'
+      });
+      
+    } catch (error) {
+      // AC5: Error logging + failed_transcription_start
+      console.error(`❌ [Pipeline] Transcription failed: ${sessionId}`);
+      console.error(`   Error:`, error.message);
+      
+      mainWindow.webContents.send('pipeline-status', {
+        sessionId,
+        status: 'failed_transcription_start',
+        message: 'Fehler beim Transkriptionsstart',
+        error: error.message
+      });
+    }
+  });
+}
+
+app.whenReady().then(() => {
+  createWindow();
+  setupOrchestrator();
+});
 
 // Kommunikation vom Renderer (Frontend)
 ipcMain.handle('convert-video', async (event, filePath) => {