test(dogfood): drop stale visibleOn row from expression ledger

ADR-0085 §3 removed fieldGroups[].visibleOn from ObjectSchema (declared,
zero consumers — enforce-or-remove per ADR-0049). The ADR-0060 ratchet
correctly flagged the ledger row as a stale cover; drop it until the key
returns with a real enforcement path.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: os-zhuang

packages/dogfood/test/expression-conformance.ledger.ts

@@ -108,7 +108,10 @@ export const EXPRESSION_SURFACE: ExprSurface[] = [
     dialect: 'cel', mode: 'interpret', state: 'enforced', failPolicy: 'fail-soft-log',
     enforcement: 'console (objectui) SchemaRenderer + server celEngine (interpret)',
     covers: [
-      'data/object.zod.ts:visibleOn',
+      // data/object.zod.ts:visibleOn (fieldGroups group-level CEL visibility)
+      // was removed by ADR-0085 §3 — declared but never consumed anywhere
+      // (enforce-or-remove, ADR-0049). Re-add the row when the key returns
+      // WITH an enforcement path.
       'ui/action.zod.ts:visible',
       'ui/app.zod.ts:visible',
       'ui/page.zod.ts:visibility',