Limit module policy CI to pull requests only

Remove push-to-main, daily schedule, and workflow_dispatch triggers.

https://claude.ai/code/session_01ReRwVdpytBRvCLn8pWHNEV

Author: claude

.github/workflows/module-policy-integration.yml

@@ -1,25 +1,13 @@
 name: Module Policy Integration Test
 
 on:
-  push:
-    branches: [main]
-    paths:
-      - Dockerfile
-      - docker-compose.module-policy.yml
-      - policies/**
-      - tests/module-policy-integration.sh
-      - server/src/**
   pull_request:
-    branches: [main]
     paths:
       - Dockerfile
       - docker-compose.module-policy.yml
       - policies/**
       - tests/module-policy-integration.sh
       - server/src/**
-  schedule:
-    - cron: "0 6 * * *" # daily at 06:00 UTC
-  workflow_dispatch:
 
 jobs:
   integration-test: