## Problem
The **Sync indicator count** check has failed on every release-bump PR since 0.7.5 (`release/0.7.6`, `release/0.7.7`, …). It is a race, not a counter mismatch.
The checkout step used the PR head **branch name**:
\`\`\`yaml
ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.ref || github.ref }}
\`\`\`
Release PRs are merged with \`gh pr merge --squash --delete-branch\`, which deletes the head branch the instant the PR merges — usually before this queued read-only check reaches its checkout. Fetching the now-gone \`refs/heads/release/X.Y.Z\` then fails with exit 1 (3 retries, then error). Push-to-main, tag and slower feature PRs stayed green because their head branch still existed when the check ran.
## Fix
Check out \`github.event.pull_request.head.sha\` instead. The head SHA stays reachable via \`refs/pull/N/head\` after the branch is deleted, so an instant merge no longer red-Xes the run. It is still the author's head commit (not the merge ref), so the counter validates exactly what will land — the existing design intent is preserved.
Because \`pull_request\` runs the workflow definition from the merge commit, the fix already applies to this PR itself.
kingchenc
8225e1ab91