Fix dev server hang by reducing log spam and event frequency (#828)

* Changes from fix/dev-server-hang

* fix: Address PR #828 review feedback

- Reset RAF buffer on context changes (worktree switch, dev-server restart)
  to prevent stale output from flushing into new sessions
- Fix high-frequency WebSocket filter to catch auto-mode:event wrapping
  (auto_mode_progress is wrapped in auto-mode:event) and add feature:progress
- Reorder Vite aliases so explicit jsx-runtime entries aren't shadowed by
  the broad /^react(\/|$)/ regex (Vite uses first-match-wins)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: Batch dev server logs and fix React module resolution order

* feat: Add fallback timer for flushing dev server logs in background tabs

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

apps/server/src/index.ts

@@ -598,24 +598,23 @@ wss.on('connection', (ws: WebSocket) => {
 
   // Subscribe to all events and forward to this client
   const unsubscribe = events.subscribe((type, payload) => {
-    logger.info('Event received:', {
+    // Use debug level for high-frequency events to avoid log spam
+    // that causes progressive memory growth and server slowdown
+    const isHighFrequency =
+      type === 'dev-server:output' || type === 'test-runner:output' || type === 'feature:progress';
+    const log = isHighFrequency ? logger.debug.bind(logger) : logger.info.bind(logger);
+
+    log('Event received:', {
       type,
       hasPayload: !!payload,
-      payloadKeys: payload ? Object.keys(payload) : [],
       wsReadyState: ws.readyState,
-      wsOpen: ws.readyState === WebSocket.OPEN,
     });
 
     if (ws.readyState === WebSocket.OPEN) {
       const message = JSON.stringify({ type, payload });
-      logger.info('Sending event to client:', {
-        type,
-        messageLength: message.length,
-        sessionId: (payload as Record<string, unknown>)?.sessionId,
-      });
       ws.send(message);
     } else {
-      logger.info('WARNING: Cannot send event, WebSocket not open. ReadyState:', ws.readyState);
+      logger.warn('Cannot send event, WebSocket not open. ReadyState:', ws.readyState);
     }
   });
 

apps/server/src/services/dev-server-service.ts

@@ -88,9 +88,13 @@ const PORT_PATTERNS: Array<{ pattern: RegExp; description: string }> = [
   },
 ];
 
-// Throttle output to prevent overwhelming WebSocket under heavy load
-const OUTPUT_THROTTLE_MS = 4; // ~250fps max update rate for responsive feedback
-const OUTPUT_BATCH_SIZE = 4096; // Smaller batches for lower latency
+// Throttle output to prevent overwhelming WebSocket under heavy load.
+// 100ms (~10fps) is sufficient for readable log streaming while keeping
+// WebSocket traffic manageable. The previous 4ms rate (~250fps) generated
+// up to 250 events/sec which caused progressive browser slowdown from
+// accumulated console logs, JSON serialization overhead, and React re-renders.
+const OUTPUT_THROTTLE_MS = 100; // ~10fps max update rate
+const OUTPUT_BATCH_SIZE = 8192; // Larger batches to compensate for lower frequency
 
 export interface DevServerInfo {
   worktreePath: string;