debug: add PTY lifecycle logging

- Log PTY PID and shell when spawned
- Log all PTY output data
- Log PTY exit events with exit code and signal
- Log when WebSocket cannot send PTY data

This will help identify if the PTY is exiting immediately
or if there's an issue with the PTY process.

services/terminal-service.js

@@ -67,6 +67,8 @@ class TerminalService {
                 env: process.env
             });
 
+            console.log(`[TerminalService] PTY spawned with PID: ${pty.pid}, shell: ${shell}`);
+
             // Store terminal info
             const terminal = {
                 id: terminalId,
@@ -140,17 +142,20 @@ class TerminalService {
 
         // Handle PTY output - send to client
         terminal.pty.onData((data) => {
+            console.log(`[TerminalService] PTY data from ${terminalId}: ${data.replace(/\n/g, '\\n').replace(/\r/g, '\\r')}`);
             if (ws.readyState === ws.OPEN) {
                 ws.send(JSON.stringify({
                     type: 'data',
                     data: data
                 }));
+            } else {
+                console.log(`[TerminalService] Cannot send PTY data - WebSocket not open (state: ${ws.readyState})`);
             }
         });
 
         // Handle PTY exit
         terminal.pty.onExit(({ exitCode, signal }) => {
-            console.log(`[TerminalService] Terminal ${terminalId} exited: ${exitCode || signal}`);
+            console.log(`[TerminalService] PTY EXIT for ${terminalId}: exitCode=${exitCode}, signal=${signal}`);
             this.logCommand(terminalId, null, `Terminal exited: ${exitCode || signal}`);
 
             if (ws.readyState === ws.OPEN) {