fix: auto-attach PTY to surviving tmux sessions on server restart

Previously, restoreMuxSessions() only created Session objects without
attaching PTY processes. Sessions stayed at pid=null until the client
manually selected them, causing terminals to appear "closed" after deploy.

Now the server calls startInteractive() for each recovered session during
startup, so all sessions resume capturing output immediately. The frontend
auto-attach condition is also relaxed from (pid===null && status==='idle')
to (pid===null && !_ended) as a safety net for edge cases.

src/web/public/app.js

@@ -2105,8 +2105,9 @@ class CodemanApp {
 
     // Track working directory for path normalization in Project Insights
     this.currentSessionWorkingDir = session?.workingDir || null;
-    if (session && session.pid === null && session.status === 'idle') {
-      // This is a restored session - attach to the existing screen/shell
+    if (session && session.pid === null && !session._ended) {
+      // Session has no PTY attached — either restored after server restart
+      // or detached for some other reason. Re-attach regardless of status.
       try {
         const endpoint = session.mode === 'shell'
           ? `/api/sessions/${sessionId}/shell`

src/web/server.ts

@@ -1766,15 +1766,28 @@ export class WebServer extends EventEmitter {
 
             this.sessions.set(session.id, session);
             await this.setupSessionListeners(session);
-            this.persistSessionState(session);
 
-            // Mark it as restored (not started yet - user needs to attach)
-            getLifecycleLog().log({
-              event: 'recovered',
-              sessionId: session.id,
-              name: session.name,
-            });
-            console.log(`[Server] Restored session ${session.id} from mux ${muxSession.muxName}`);
+            // Auto-attach PTY to the surviving tmux session immediately.
+            // This ensures ALL sessions resume capturing output right away,
+            // not just the one the client happens to select first.
+            try {
+              await session.startInteractive();
+              getLifecycleLog().log({
+                event: 'recovered',
+                sessionId: session.id,
+                name: session.name,
+              });
+              console.log(`[Server] Restored and attached session ${session.id} from mux ${muxSession.muxName}`);
+            } catch (attachErr) {
+              console.error(`[Server] Failed to attach session ${session.id}, keeping as detached:`, attachErr);
+              getLifecycleLog().log({
+                event: 'recovered',
+                sessionId: session.id,
+                name: session.name,
+              });
+            }
+
+            this.persistSessionState(session);
           }
         }