chore(spec): the dropped-refinement ledger's header total follows its five new sites

Claude-Session: https://claude.ai/code/session_01Sfe5YjBLwB9J3y8fvm2xq1
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/spec/dropped-refinements.baseline.json

@@ -3,7 +3,7 @@
   "measured": {
     "zod": "4.4.3",
     "publishedSchemasWithDroppedRefinements": 212,
-    "droppedRefinementSites": 612,
+    "droppedRefinementSites": 617,
     "refinementSitesThatDidProject": 369,
     "refinementSitesWithNoJsonFormToCompare": 0
   },