fix(#2138): push the track_shipping ship-note onto the PR branch [ci skip]

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

tests/workflow-size-baseline.json

@@ -71,7 +71,7 @@
   "settings-advanced.md": 40019,
   "settings-integrations.md": 15892,
   "settings.md": 33467,
-  "ship.md": 24691,
+  "ship.md": 25107,
   "sketch-wrap-up.md": 14267,
   "sketch.md": 20004,
   "smart-entry.md": 11124,