chore(#1867): regen goldens + size baselines after merge onto next

next advanced to a3b9cbae (incl. #1820 specless-rail merge); regenerate
golden-install-parity fixtures + workflow-size-baseline authoritatively.
Manifest + agent baseline already in sync. plan-phase.md conflict
hand-merged to keep both EDGE_ABSENT/PROHIB_ABSENT and UI Considerations.

tests/workflow-size-baseline.json

@@ -53,7 +53,7 @@
   "onboard.md": 8590,
   "pause-work.md": 14441,
   "plan-milestone-gaps.md": 11809,
-  "plan-phase.md": 92251,
+  "plan-phase.md": 93113,
   "plan-review-convergence.md": 23512,
   "plant-seed.md": 11785,
   "pr-branch.md": 15963,
@@ -82,7 +82,7 @@
   "sync-skills.md": 6125,
   "thread.md": 12508,
   "transition.md": 22060,
-  "ui-phase.md": 15521,
+  "ui-phase.md": 25338,
   "ui-review.md": 11216,
   "ultraplan-phase.md": 10512,
   "undo.md": 10431,