🤖 Fix: Catch runtime creation errors in WORKSPACE_CREATE handler

The WORKSPACE_CREATE IPC handler wasn't catching errors thrown during
runtime creation (e.g., validation errors for tilde paths in SSH runtime).
This caused tests to fail with unhandled exceptions instead of returning
{ success: false, error: ... } as expected.

Wrap createRuntime() call in try-catch to properly handle validation errors
and return them through the IPC boundary.

Fixes integration test: 'rejects tilde paths in srcBaseDir (SSH only)'

_Generated with `cmux`_

Author: ammar-agent

src/services/ipcMain.ts

@@ -283,7 +283,15 @@ export class IpcMain {
           type: "local",
           srcBaseDir: this.config.srcDir,
         };
-        const runtime = createRuntime(finalRuntimeConfig);
+
+        // Create runtime - catch validation errors (e.g., tilde paths in SSH)
+        let runtime;
+        try {
+          runtime = createRuntime(finalRuntimeConfig);
+        } catch (error) {
+          const errorMsg = error instanceof Error ? error.message : String(error);
+          return { success: false, error: errorMsg };
+        }
 
         // Create session BEFORE starting init so events can be forwarded
         const session = this.getOrCreateSession(workspaceId);