minor: remove reference to codex in state.md block modification

Author: SihaoLiu

prompt-template/block/state-file-modification.md

@@ -1,10 +1,3 @@
 # State File Modification Blocked
 
-You cannot modify `state.md`. This file is managed by the loop system.
-
-The state file contains:
-- Current round number
-- Max iterations
-- Codex configuration
-
-Modifying it would corrupt the loop state.
+You cannot modify `state.md`. This file is managed by the loop system. Modifying it would corrupt the loop state. If you think the work is done, just stop and another round of review will be auto-triggered.