fix: use grep -A 2 to show diff details after each "There are changes" line

The change details (JSON diff + description) are logged on the 2 lines
immediately after "There are changes for branch", not before it.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

.github/workflows/pr-dry-run.yml

@@ -66,6 +66,6 @@ jobs:
         run: |
           if grep -q "There are changes for branch" /tmp/dry-run.log; then
             echo "::warning::Config changes detected — human review required before merging"
-            grep -E "NOPCOMMAND|There are changes for branch" /tmp/dry-run.log
+            grep -A 2 "There are changes for branch" /tmp/dry-run.log
             exit 1
           fi