publish-site: push HEAD:site from a throwaway orphan

The local branch survived the worktree and collided on the second run.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

scripts/publish-site.sh

@@ -9,13 +9,13 @@ WORK=$(mktemp -d)
 trap 'rm -rf "$WORK"' EXIT
 git worktree add -q --detach "$WORK"
 cd "$WORK"
-git checkout -q --orphan site
+git checkout -q --orphan publish-tmp
 git rm -rq --cached . 2>/dev/null || true
 find . -mindepth 1 -maxdepth 1 ! -name .git -exec rm -rf {} +
 mkdir dist && cp -R "$OLDPWD/dist/." dist/
 git add -A
 git commit -q -m "site: built from $SHA"
-git push -qf origin site
+git push -qf origin HEAD:site
 cd "$OLDPWD"
 git worktree remove --force "$WORK"
 echo "published site branch from $SHA"