The coordinator contract gains a 'Before done' paragraph and the handoff
order GSTACK_RESULT, gstack: ok|fail <rev>, PREGATE:, gate summary; the
spec section is regenerated and docs/unattended.md states the same rule.
A new test pins the terms and their order; the byte-identity pins stay.
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>