feat: ungate sidebar agent + raise timeout to 5 minutes (v0.12.0)

Sidebar chat is now always available in headed mode — no --chat flag needed.
Agent tasks get 5 minutes instead of 2, enabling multi-page workflows like
navigating directories and filling forms across pages.

Changes:
- cli.ts: remove --chat flag, always set BROWSE_SIDEBAR_CHAT=1, always spawn agent
- server.ts: remove chatEnabled gate (403 response), raise AGENT_TIMEOUT_MS to 300s
- sidebar-agent.ts: raise child process timeout from 120s to 300s

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

browse/src/cli.ts

@@ -520,18 +520,15 @@ Refs:           After 'snapshot', use @e1, @e2... as selectors:
     // Delete stale state file
     try { fs.unlinkSync(config.stateFile); } catch {}
 
-    const chatMode = commandArgs.includes('--chat');
+    console.log('Launching headed Chromium with extension + sidebar agent...');
-    console.log(chatMode
-      ? 'Launching headed Chromium with extension + standalone chat (experimental)...'
-      : 'Launching headed Chromium with extension...');
     try {
       // Start server in headed mode with extension auto-loaded
       // Use a well-known port so the Chrome extension auto-connects
       const serverEnv: Record<string, string> = {
         BROWSE_HEADED: '1',
         BROWSE_PORT: '34567',
+        BROWSE_SIDEBAR_CHAT: '1',
       };
-      if (chatMode) serverEnv.BROWSE_SIDEBAR_CHAT = '1';
       const newState = await startServer(serverEnv);
 
       // Print connected status
@@ -547,31 +544,28 @@ Refs:           After 'snapshot', use @e1, @e2... as selectors:
       const status = await resp.text();
       console.log(`Connected to real Chrome\n${status}`);
 
-      // Auto-start sidebar agent only when --chat is enabled
+      // Auto-start sidebar agent
-      if (chatMode) {
+      const agentScript = path.resolve(__dirname, 'sidebar-agent.ts');
-        const agentScript = path.resolve(__dirname, 'sidebar-agent.ts');
+      try {
-        const agentLogFile = path.join(process.env.HOME || '/tmp', '.gstack', 'sidebar-agent.log');
+        // Clear old agent queue
-        try {
+        const agentQueue = path.join(process.env.HOME || '/tmp', '.gstack', 'sidebar-agent-queue.jsonl');
-          // Clear old agent queue
+        try { fs.writeFileSync(agentQueue, ''); } catch {}
-          const agentQueue = path.join(process.env.HOME || '/tmp', '.gstack', 'sidebar-agent-queue.jsonl');
-          try { fs.writeFileSync(agentQueue, ''); } catch {}
 
-          const agentProc = Bun.spawn(['bun', 'run', agentScript], {
+        const agentProc = Bun.spawn(['bun', 'run', agentScript], {
-            cwd: config.projectDir,
+          cwd: config.projectDir,
-            env: {
+          env: {
-              ...process.env,
+            ...process.env,
-              BROWSE_BIN: path.resolve(__dirname, '..', 'dist', 'browse'),
+            BROWSE_BIN: path.resolve(__dirname, '..', 'dist', 'browse'),
-              BROWSE_STATE_FILE: config.stateFile,
+            BROWSE_STATE_FILE: config.stateFile,
-              BROWSE_SERVER_PORT: String(newState.port),
+            BROWSE_SERVER_PORT: String(newState.port),
-            },
+          },
-            stdio: ['ignore', 'ignore', 'ignore'],
+          stdio: ['ignore', 'ignore', 'ignore'],
-          });
+        });
-          agentProc.unref();
+        agentProc.unref();
-          console.log(`[browse] Sidebar agent started (PID: ${agentProc.pid})`);
+        console.log(`[browse] Sidebar agent started (PID: ${agentProc.pid})`);
-        } catch (err: any) {
+      } catch (err: any) {
-          console.error(`[browse] Sidebar agent failed to start: ${err.message}`);
+        console.error(`[browse] Sidebar agent failed to start: ${err.message}`);
-          console.error(`[browse] Run manually: bun run ${agentScript}`);
+        console.error(`[browse] Run manually: bun run ${agentScript}`);
-        }
       }
     } catch (err: any) {
       console.error(`[browse] Connect failed: ${err.message}`);

browse/src/server.ts

@@ -36,7 +36,7 @@ ensureStateDir(config);
 const AUTH_TOKEN = crypto.randomUUID();
 const BROWSE_PORT = parseInt(process.env.BROWSE_PORT || '0', 10);
 const IDLE_TIMEOUT_MS = parseInt(process.env.BROWSE_IDLE_TIMEOUT || '1800000', 10); // 30 min
-const chatEnabled = process.env.BROWSE_SIDEBAR_CHAT === '1';
+// Sidebar chat is always enabled in headed mode (ungated in v0.12.0)
 
 function validateAuth(req: Request): boolean {
   const header = req.headers.get('authorization');
@@ -116,7 +116,7 @@ interface SidebarSession {
 }
 
 const SESSIONS_DIR = path.join(process.env.HOME || '/tmp', '.gstack', 'sidebar-sessions');
-const AGENT_TIMEOUT_MS = 120_000;
+const AGENT_TIMEOUT_MS = 300_000; // 5 minutes — multi-page tasks need time
 const MAX_QUEUE = 5;
 
 let sidebarSession: SidebarSession | null = null;
@@ -811,7 +811,7 @@ async function start() {
           tabs: browserManager.getTabCount(),
           currentUrl: browserManager.getCurrentUrl(),
           token: AUTH_TOKEN,  // Extension uses this for Bearer auth
-          chatEnabled,
+          chatEnabled: true,
           agent: {
             status: agentStatus,
             runningFor: agentStartTime ? Date.now() - agentStartTime : null,
@@ -910,13 +910,7 @@ async function start() {
 
       // ─── Sidebar endpoints (auth required — token from /health) ────
 
-      // Gate all sidebar/chat routes behind --chat flag
+      // Sidebar routes are always available in headed mode (ungated in v0.12.0)
-      if (!chatEnabled && url.pathname.startsWith('/sidebar')) {
-        return new Response(JSON.stringify({ error: 'Chat not enabled. Use: $B connect --chat' }), {
-          status: 403,
-          headers: { 'Content-Type': 'application/json' },
-        });
-      }
 
       // Sidebar chat history — read from in-memory buffer
       if (url.pathname === '/sidebar-chat') {

browse/src/sidebar-agent.ts

@@ -205,14 +205,14 @@ async function askClaude(queueEntry: any): Promise<void> {
       });
     });
 
-    // Timeout after 120 seconds
+    // Timeout after 300 seconds (5 min — multi-page tasks need time)
     setTimeout(() => {
       try { proc.kill(); } catch {}
-      sendEvent({ type: 'agent_error', error: 'Timed out after 120s' }).then(() => {
+      sendEvent({ type: 'agent_error', error: 'Timed out after 300s' }).then(() => {
         isProcessing = false;
         resolve();
       });
-    }, 120000);
+    }, 300000);
   });
 }