@@ -11,7 +11,7 @@ Clause-②: yes (widening)
 
 - **The kind.** `PicklistSchema` — `{ name, label, description?, options }`, where `options` is the field option shape (`SelectOptionSchema`) reused as is. Authored in a package as `*.picklist.ts` (`definePicklist`) or `defineStack({ picklists })`. It is a registered kind (`MetadataTypeSchema`, `DEFAULT_METADATA_TYPE_REGISTRY`, `getMetadataTypeSchema('picklist')`) that loads before `object`. It is package-owned, so a runtime create or a per-organization overlay is refused.
 - **The reference.** `Field.select({ picklist: 'industry' })` adds a `picklist` key to `FieldSchema`. It is valid on the option types only (select, radio, multiselect, checkboxes, tags). A field that declares both `picklist` and `options` is refused at `options`, with a prescription. The functional-completeness predicate counts a `picklist` reference as the field's option source.
-- **The served shape.** `PicklistServedFieldSchema` declares what a client reads for a picklist-bound field: the resolved `options` next to the `picklist` that names the list. This release does not resolve the reference. Until the runtime does, a picklist-bound field is served without options, and the liveness ledger grades the key `planned` and warns an author who writes it.
+- **The served shape.** `PicklistServedFieldSchema` declares what a client reads for a picklist-bound field: the resolved `options` next to the `picklist` that names the list. The runtime resolves the reference onto that served field; see the picklist runtime entry of this release.
 - **Extensions.** `defineStack({ picklistExtensions: [{ extend, options }] })` adds options to a picklist that another package owns. It can only add; removing or renaming a value stays with the owning package.
 - **Translation.** `TranslationData` gains `picklists.<name>.{ label?, options: { value: label } }`. `translatePicklist` translates a served picklist item. `translateObject` gives a picklist-bound field the list's option labels, and a field-level `options` entry still wins over them.
 - **Studio type label.** `@objectstack/platform-objects` carries the `picklist` type's label and description in its metadata-forms translation bundles (en, zh-CN, ja-JP, es-ES).
 
@@ -0,0 +1,17 @@
+---
+'@objectstack/objectql': minor
+'@objectstack/metadata': patch
+'@objectstack/spec': patch
+---
+
+feat(objectql): the runtime resolves a field's `picklist` onto its served options, validates writes against the resolved list, and merges `picklistExtensions` additively
+
+Clause-②: no
+
+- **Load.** `defineStack({ picklists })` and `defineStack({ picklistExtensions })` now register, from a manifest and from a nested plugin, through the same registration seam as every other collection. The compiled-artifact door registers `picklists` as `picklist` items, so `GET /meta/picklist` serves them on an artifact boot.
+- **Merge.** A picklist's options are its own, followed by the options every `picklistExtensions` entry adds. A value the list already carries is refused with `422 INVALID_METADATA`, which names both declarations, whichever of the two registered first. The later declaration never replaces the earlier one. A package that registers again replaces its own extension. Uninstalling a package removes the values it added.
+- **Serve.** A field with `picklist: 'NAME'` is served with the resolved options written onto it and `picklist` kept (`PicklistServedFieldSchema`), on every object read, including objects stored in `sys_metadata`. The list's translations (`picklists.NAME.options.VALUE`) relabel those options per request locale. An option marked `default: true` in the list fills an omitted field on insert, as an inline option does, and the import template reads it the same way.
+- **Unknown name.** A packaged field that names a picklist no loaded package declares fails the boot at `kernel:ready` with `INVALID_METADATA`, and so does a `picklistExtensions` entry that extends such a list. The error names every such field or extension and the package that declared it. After boot, an artifact registered through the `manifest` service is checked before any of it registers. A field whose list does not resolve is served with no options and accepts no value.
+- **Write validation.** The write door judges a picklist-bound field against the resolved options, and its refusal names the picklist. The wire code stays `invalid_option`. The validation message catalog gains three message keys for this (`invalid_option_picklist`, `invalid_option_value_picklist`, `invalid_option_picklist_unresolved`) in en, zh-CN, ja-JP and es-ES. They change the message text only, never the wire.
+- **Writing the served body back.** The served body carries `picklist` and `options` together. Writing it back through the metadata door is still refused, with the prescription to drop `options`, as `FieldSchema` declares. Nothing strips it on the write side.
+- **Ledger.** `field.picklist`, the `picklist` kind's rows and `translation.picklists` are `live`. `field.picklist` no longer carries `authorWarn`, so `os lint` / `os validate` stop warning an author who writes it.
@@ -1432,10 +1432,11 @@ describe('the object/field walk, against a synthetic ledger directory (#19268)',
   // If `field.json` ever warns again these two flip, and the block above
   // ("field walk: a malformed `fields` array …") can take its real subject back
   // — but this block keeps working either way, which is the point.
-  it('the SHIPPED field ledger warns on `picklist` alone — which is why the walk needs a subject of its own', () => {
-    // `picklist` is `planned` + `authorWarn` until the server resolves picklist
-    // references; the synthetic slot below is still warned by nothing shipped.
-    expect([...authorWarnedProperties('field')]).toEqual(['picklist']);
+  it('the SHIPPED field ledger warns on nothing — which is why the walk needs a subject of its own', () => {
+    // `picklist` was the last warned row (`planned` + `authorWarn`) and left
+    // when the server began resolving picklist references (`live`); the
+    // synthetic slot below is warned by nothing shipped either.
+    expect([...authorWarnedProperties('field')]).toEqual([]);
     expect(
       lintLivenessProperties({
         objects: [{ name: 'widget', fields: [{ name: 'a', synthWarnedSlot: true }] }],
 
@@ -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' });
+    });
+});
@@ -178,6 +178,12 @@ const ARTIFACT_FIELD_TO_TYPE: Record<string, string> = {
     ragPipelines: 'rag_pipeline',
     hooks: 'hook',
     mappings: 'mapping',
+    // Shared option lists. Registered as items here so the artifact boot
+    // serves `GET /meta/picklist` like every other kind; what a FIELD is
+    // served with is resolved by the ObjectQL registry, which also merges
+    // `picklistExtensions` into the list they name — that collection is not a
+    // kind of its own and has no entry here (see check:stack-collection-maps).
+    picklists: 'picklist',
     analyticsCubes: 'analytics_cube',
     connectors: 'connector',
     emailTemplates: 'email_template',
 
@@ -46,6 +46,7 @@ const REPRESENTATIVE: Record<string, Record<string, unknown>> = {
   hook: { name: 'account_audit', object: 'account', events: ['beforeInsert'], handler: 'audit_account' },
   seed: { object: 'account', records: [{ name: 'Acme' }] },
   mapping: { name: 'account_import', targetObject: 'account', fieldMapping: [] },
+  picklist: { name: 'industry', label: 'Industry', options: [{ label: 'Technology', value: 'technology' }] },
   datasource: { name: 'warehouse', driver: 'sqlite', config: {} },
   analytics_cube: { name: 'account_cube', sql: 'account', measures: {}, dimensions: {} },
   page: { name: 'account_home', label: 'Account Home', regions: [] },
@@ -81,7 +82,7 @@ const REPRESENTATIVE: Record<string, Record<string, unknown>> = {
  */
 const BOUND_SCHEMA: Record<string, string> = {
   object: 'ObjectSchema', field: 'FieldSchema', hook: 'HookSchema', seed: 'SeedSchema',
-  mapping: 'MappingSchema', datasource: 'DatasourceSchema', analytics_cube: 'CubeSchema',
+  mapping: 'MappingSchema', picklist: 'PicklistSchema', datasource: 'DatasourceSchema', analytics_cube: 'CubeSchema',
   page: 'PageSchema', dashboard: 'DashboardSchema', app: 'AppSchema', action: 'ActionSchema',
   report: 'ReportSchema', dataset: 'DatasetSchema', flow: 'FlowSchema', webhook: 'WebhookSchema',
   job: 'JobSchema', translation: 'TranslationItemSchema', email_template: 'EmailTemplateDefinitionSchema',
 
@@ -53,6 +53,7 @@ const ANNOTATION_BY_METADATA_TYPE: ReadonlyMap<string, readonly [typeName: strin
   ['hook', ['Hook', 'data']],
   ['seed', ['Seed', 'data']],
   ['mapping', ['Mapping', 'data']],
+  ['picklist', ['Picklist', 'data']],
   ['datasource', ['Datasource', 'data']],
   ['analytics_cube', ['Cube', 'data']],
   ['page', ['Page', 'ui']],