track_shipping committed the STATE ship-note ('Phase N shipped — PR #N') AFTER
create_pr and never pushed it, so the commit stayed local-only. When the GitHub
PR merged (especially fast/auto-merge) the ship-note was not in the source branch
and never reached the default branch — STATE's ship-status was silently lost,
recoverable only by STATE self-heal on the next /gsd-start.
Push the ship-note commit onto the PR branch with a [ci skip] trailer. GitHub
honors [ci skip]/[skip ci], so this lands the note on merge without triggering a
redundant pipeline, and preserves the PR number in STATE.
Recaptures the 18 golden-install-parity fixtures + the workflow-size baseline
(only the ship.md entry changed in each).
Closes#2138