🤖 fix: wait for plan file deletion

deletePlanFilesForWorkspace() used runtime.exec() without waiting for completion, which could race tests (and callers) that expect the plan file to be gone once replaceChatHistory resolves. Await stdin.close() + exitCode.

Author: ammar-agent

src/node/services/workspaceService.ts

@@ -1087,12 +1087,25 @@ export class WorkspaceService extends EventEmitter {
     });
 
     try {
-      // Use exec to delete files since runtime doesn't have a deleteFile method
-      // Delete both paths in one command for efficiency
-      await runtime.exec(`rm -f ${quotedPlanPath} ${quotedLegacyPlanPath}`, {
+      // Use exec to delete files since runtime doesn't have a deleteFile method.
+      // Delete both paths in one command for efficiency.
+      //
+      // IMPORTANT: runtime.exec() returns streams immediately; we must wait for completion
+      // so callers can safely assume the plan file is gone when this function resolves.
+      const stream = await runtime.exec(`rm -f ${quotedPlanPath} ${quotedLegacyPlanPath}`, {
         cwd: metadata.projectPath,
         timeout: 10,
       });
+
+      try {
+        await stream.stdin.close();
+      } catch {
+        // Ignore stdin-close errors (e.g. already closed).
+      }
+
+      await stream.exitCode.catch(() => {
+        // Best-effort: ignore failures.
+      });
     } catch {
       // Plan files don't exist or can't be deleted - ignore
     }