ci: run CodeAnt on PR base and last commit on main

.gitea/workflows/codeant.yml

@@ -1,6 +1,8 @@
 name: CodeAnt AI Review - Stage 1
 
 on:
+  pull_request:
+    branches: ["main"]
   push:
     branches: ["main"]
   workflow_dispatch:
@@ -32,6 +34,11 @@ jobs:
 
       - name: Debug Commit Info
         run: |
+          echo "==== EVENT CONTEXT ===="
+          echo "event_name=${GITHUB_EVENT_NAME}"
+          echo "base_ref=${GITHUB_BASE_REF}"
+          echo "ref_name=${GITHUB_REF_NAME}"
+
           echo "==== LAST 3 COMMITS ===="
           git log --oneline -n 3
 
@@ -40,5 +47,9 @@ jobs:
 
       - name: Run CodeAnt Review
         run: |
-          codeant review > review.txt || true
+          if [ "${GITHUB_EVENT_NAME}" = "pull_request" ] && [ -n "${GITHUB_BASE_REF}" ]; then
+            codeant review --base "${GITHUB_BASE_REF}" > review.txt || true
+          else
+            codeant review --last-commit > review.txt || true
+          fi
           cat review.txt