debug: add detailed spawn attempt and error logging

- Log spawn attempt before calling spawn()
- Add detailed error logging with stack trace
- This will help identify if spawn is failing silently

services/terminal-service.js

@@ -58,6 +58,8 @@ class TerminalService {
         const terminalId = `term-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
 
         try {
+            console.log(`[TerminalService] Attempting to spawn PTY with shell: ${shell}, cwd: ${workingDir}`);
+
             // Spawn PTY process
             const pty = spawn(shell, [], {
                 name: 'xterm-color',
@@ -91,6 +93,9 @@ class TerminalService {
             return { success: true, terminalId, terminal };
         } catch (error) {
             console.error(`[TerminalService] Failed to create terminal:`, error);
+            console.error(`[TerminalService] Error stack:`, error.stack);
+            console.error(`[TerminalService] Error name:`, error.name);
+            console.error(`[TerminalService] Error message:`, error.message);
             return { success: false, error: error.message };
         }
     }