some readme changes

README.md

@@ -254,23 +254,11 @@ Prompt-injection-env/
 - [openenv.yaml](/C:/Users/Admin/Desktop/My%20projects/Prompt-injection-env/openenv.yaml)
   Environment metadata for OpenEnv packaging and deployment.
 
-### Pre-submission checks
 
-Run the local validator before pushing a submission:
-
-```bash
-python pre_submission_check.py
-```
-
-If you only want structural checks without starting a local server:
-
-```bash
-python pre_submission_check.py --skip-runtime
-```
 
 ### CI and sync
 
-The repo now includes GitHub workflows for:
+Includes GitHub workflows for:
 
 - continuous integration in [.github/workflows/ci.yml](/C:/Users/Admin/Desktop/My%20projects/Prompt-injection-env/.github/workflows/ci.yml)
 - syncing `main` to Hugging Face Spaces in [.github/workflows/sync.yml](/C:/Users/Admin/Desktop/My%20projects/Prompt-injection-env/.github/workflows/sync.yml)