fix cutoff gen port

.cursor/rules/documentation-update-discipline.mdc

@@ -0,0 +1,15 @@
+---
+description: When changing implementation, update relevant docs
+alwaysApply: true
+---
+
+# Documentation update discipline
+
+- When you make an **implementation change** (Python/SQL/frontend), you must also update the **relevant documentation**
+  in `docs/` (and/or `CLAUDE.md` if it’s normative guidance) in the same change set.
+- The docs update must cover:
+  - what behavior changed (externally visible / operational impact),
+  - where it is implemented (file/function names),
+  - how to verify it (DB table/view, API endpoint, or operational check).
+
+If there is no existing relevant document, add a short section to the closest module doc under `docs/04-modules/`.