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ci: address third Copilot follow-up

- Match the mercure require entry in caddy/go.mod under both block and
  single-line forms so a future `go mod tidy` reformat doesn't fail the
  resume verification.
- Detect a release-shaped main HEAD without tags as resumable, covering
  the case where a previous run pushed the commit but failed before
  create_tag.
- Guard against main advancing between checkout and the commit step by
  asserting parent_sha equals the original checkout SHA before building
  the API tree.
- release.sh: restore set -o errtrace so the ERR trap fires inside any
  future helpers, and fetch tags so the operator sees existing release
  tags before dispatching.