test(dogfood,metadata-protocol): cite ADR-0054 for the picklist dogfood proof; pin object.fields.picklist as a picklist reference site

Claude-Session: https://claude.ai/code/session_01MZu5JqVPacMktogpMxq9Xu
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/metadata-protocol/src/reference-sites.derivation.test.ts

@@ -211,3 +211,14 @@ describe('[#9190] derived reference sites — derivation is a pure function of t
         expect(flatten(a)).toEqual(flatten(REFERENCE_SITES));
     });
 });
+
+describe('a field\'s `picklist` is a reference site of the `picklist` kind', () => {
+    // The admin "Used by" panel and the delete-safety check read this index. A
+    // select field that names a shared list (`Field.select({ picklist })`)
+    // must count as a use of that list, or the list reads as safe to delete
+    // while objects take their options from it. Derived by the naming rule —
+    // the property spells the target — so no row exists to forget.
+    it('object.fields{}.picklist points at the picklist it names', () => {
+        expect(sitesFor('picklist')).toContainEqual({ fromType: 'object', property: 'picklist' });
+    });
+});

packages/qa/dogfood/test/picklist-shared-across-objects.dogfood.test.ts

@@ -1,7 +1,7 @@
 // Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
 //
 // GOLDEN REGRESSION — one shared picklist, two objects, two packages, booted for
-// real and driven through the HTTP doors a client uses (ADR-0136 D2.4).
+// real and driven through the HTTP doors a client uses (the ADR-0054 runtime proof).
 //
 // The picklist kind lets several select fields name ONE option list
 // (`Field.select({ picklist: 'industry' })`) instead of copying `options` into