Update PR sync script to skip redundant fetch and enforce cargo fmt check

Author: oleander

Justfile

@@ -34,10 +34,6 @@ pr PR_NUMBER CMD:
     docker build --build-arg PR_NUMBER={{PR_NUMBER}} --build-arg GH_TOKEN=$(gh auth token) --target pr-tester -t git-ai-pr-tester .
     docker run -i --rm -e GITHUB_TOKEN=$(gh auth token) git-ai-pr-tester bash -c "{{CMD}}"
 
-# Sync all open PRs with origin/main
-sync-prs:
-    ./scripts/sync-all-prs
-
 # Sync a specific PR with origin/main
 sync-pr PR_NUM:
-    just pr {{PR_NUM}} "git fetch origin main && git merge origin/main --no-edit && cargo fmt --all && cargo check && git push origin HEAD"
+    just pr {{PR_NUM}} "git merge origin/main --no-edit && cargo fmt --check && cargo check && git push origin HEAD"