diff --git a/.changeset/23026-retired-component-prop-refused.md b/.changeset/23026-retired-component-prop-refused.md
new file mode 100644
index 00000000000..d97ae066c35
--- /dev/null
+++ b/.changeset/23026-retired-component-prop-refused.md
@@ -0,0 +1,29 @@
+---
+'@objectstack/lint': major
+---
+
+A retired page-component prop is refused at `objectstack validate`, `objectstack build` and `objectstack lint`. Before this change, a key that `ComponentPropsMap` tombstones with `retiredKey()` (`object-grid` `defaultFilters`, `element:record_picker` `displayField`, `page:header` `breadcrumb` and the rest) drew only a `component-props-invalid` warning. The command printed "✓ Validation passed" and built the artifact, while the conversion registry told authors the key is refused. It is now a `component-props-invalid` error carrying the tombstone's prescription, and the stack does not pass until the key is gone.
+
+Clause-②: no (narrowing)
+
+<!-- adr-0087: not-required (already-registered object-grid-default-filters-removed, object-grid-default-sort-removed, object-grid-resizable-columns-removed, object-kanban-quick-add-removed, page-header-breadcrumb-removed, page-structure-inert-keys-removed, page-card-body-to-children, page-tabs-type-to-tab-style, record-details-layout-removed, record-picker-display-field-to-label-field, record-picker-inert-keys-removed, element-input-target-variable-removed, element-flat-data-binding-to-data-source, element-filter-removed, element-form-removed, object-master-detail-form-detail-sort-field-removed, list-view-navigation-view-retired, form-field-public-picker-retired, chart-config-aria-retired, ui-ai-chat-window-retired) Every key this refuses was retired, with its tombstone prescription and its ledger entry, before this change. This diff moves only the severity of the lint finding that carries the prescription, so it adds no entry and amends none. -->
+
+**BREAKING**: an accept-set narrowing on a published authoring surface (the `component-props-invalid` rule of `objectstack validate`, `objectstack build` and `objectstack lint`).
+
+**What is refused.** A value verdict a tombstone raises: the tombstone's own issue, wherever the key sits in the props bag, an array entry's key included. A tombstoned key inside a union member is refused when that member is the only one judging keys (`object-form` `sections[].fields[]` `publicPicker`). A retired element's props row (`user:profile`, `ai:chat_window`) raises the same issue and is refused the same way.
+
+**What stays a warning.** Every other `component-props-invalid` finding: a wrong type, a missing required prop, a closed-set refusal (a url action's `target` scheme, a `record:details` section's `count`), a retired enum value and a missing `dataSource.object` binding. Every `component-props-unknown-key` finding also stays a warning.
+
+**Not judged here.** The runtime publish door (the Studio, REST `/meta`, MCP) does not run this rule, so a page saved there is not refused for a retired prop. `defineStack` and the stack schema keep the open `properties` bag as written.
+
+## FROM → TO
+
+| you wrote | write instead |
+|:--|:--|
+| `object-grid` `properties: { defaultFilters: [...] }` with an empty `filter` | `properties: { filter: [...] }` |
+| `element:record_picker` `properties: { displayField: 'title' }` | `properties: { labelField: 'title' }` |
+| a retired prop whose prescription says to delete it, e.g. `page:header` `breadcrumb` | nothing: delete the key |
+
+**The one-line fix: apply the prescription the error prints.** Where an ADR-0087 conversion covers the key, `objectstack migrate meta --from <N>` lists the mechanical edits for existing sources.
+
+**Who is affected, measured.** At objectstack `21c86444e`, this rule ran over `examples/app-crm`, `app-todo`, `app-multi-package` and `app-showcase` (through `objectstack validate`), over the five shipped pages outside them (`@objectstack/platform-objects` ×3, `@objectstack/plugin-approvals`, `packages/qa/downstream-contract`) and over the `create-objectstack` template, which authors no page. Result: 0 newly refused, and 0 findings of this rule of any kind. Deployed metadata and other repositories were not measured.
diff --git a/content/docs/deployment/validating-metadata.mdx b/content/docs/deployment/validating-metadata.mdx
index b4632a5b62c..b027484c316 100644
--- a/content/docs/deployment/validating-metadata.mdx
+++ b/content/docs/deployment/validating-metadata.mdx
@@ -470,6 +470,7 @@ orthogonal to both, and no cell here can carry it; it is written out in
 | Chart bindings outside dashboards (#3583) | ✓ | ✓ | ✓ | — |
 | Navigation vs. granted access (ADR-0090 D6) | ✓ | ✓ | ✓ | — |
 | SDUI scoped styling (ADR-0065) | ✓ | ✓ | ✓ | — |
+| Retired SDUI component props — a key `ComponentPropsMap` tombstones (`retiredKey()`), refused with its prescription (#23026) | ✓ | ✓ | ✓ | — |
 | JSX / React page source parses (ADR-0080/0081) | ✓ | ✓ | ✓ | — |
 | Approval-node approvers (ADR-0090 D3) | ✓ | ✓ | ✓ | ✓ᶠ |
 | Security posture (ADR-0090 — e.g. every custom object declares `sharingModel`) | ✓ | ✓ | ✓ | ✓ˢᵖᵉᵇᵒ |
@@ -484,7 +485,7 @@ orthogonal to both, and no cell here can carry it; it is written out in
 | Flow authoring anti-patterns (#1874) | ✓ | ✓ | ✓ | ✓ᶠ |
 | Flow trigger readiness — a flow that looks armed and never launches (#5762) | ✓ | ✓ | ✓ | ✓ᶠ |
 | `views[]` conditional-visibility predicates — CEL syntax, parse budget, bare identifiers, binding-root layer, schema path refs (ADR-0089 D3b, #7010) | ✓ | ✓ | ✓ | ✓ᵛ |
-| Advisory: record titles, semantic field pointers (ADR-0085), form-section layout, action placement, SDUI component props, seed replay/state safety, capability references, liveness | ✓ | ✓ | ✓ | — |
+| Advisory: record titles, semantic field pointers (ADR-0085), form-section layout, action placement, SDUI component props (every finding but a retired prop), seed replay/state safety, capability references, liveness | ✓ | ✓ | ✓ | — |
 | Package docs — flatness, prefixes, links (ADR-0046) | ✓ | ✓ | ✓ | — |
 | Undeclared authoring keys — every metadata collection (#3786) and the stack's own top-level keys (#4167) | ✓ | ✓ | — | — |
 | Declared-unique scope — a bare `unique: true` index, a field-level and index-level double declaration, legacy organization composites (ADR-0120 D5) | ✓ | ✓ | ✓ | — |
diff --git a/content/docs/protocol/objectui/layout-dsl.mdx b/content/docs/protocol/objectui/layout-dsl.mdx
index bd231457a59..e728d045fd4 100644
--- a/content/docs/protocol/objectui/layout-dsl.mdx
+++ b/content/docs/protocol/objectui/layout-dsl.mdx
@@ -739,9 +739,10 @@ properties:
 <Callout type="info">
   `properties` is an open bag (`Record<string, unknown>`), so **it is the one part
   of a component the spec parse does not check**. For the platform's own types the
-  authoring rules dispatch `ComponentPropsMap` and reject a misspelled prop; a
-  `custom.*` type has no entry there, so its props are validated only by whatever
-  registered the component.
+  authoring rules (`os validate`, `os build`, `os lint`) dispatch `ComponentPropsMap`:
+  a misspelled prop is reported as a warning, and a retired prop is refused as an
+  error, with its prescription. A `custom.*` type has no entry there, so its props
+  are validated only by whatever registered the component.
 </Callout>
 
 ## Advanced Layouts
diff --git a/packages/lint/src/authoring-rules.ts b/packages/lint/src/authoring-rules.ts
index 0486b052387..850487eb5b5 100644
--- a/packages/lint/src/authoring-rules.ts
+++ b/packages/lint/src/authoring-rules.ts
@@ -1176,27 +1176,18 @@ export const AUTHORING_RULES: readonly AuthoringRule[] = [
   // while a schema error elsewhere in the stack cannot take these findings down
   // with it.
   //
-  // Advisory, deliberately, and this is the whole shape of #5068's first step:
-  // wiring the parse is the precondition for enforcement, not the enforcement
-  // (#5020, one surface over). The live corpus violates the declarations in two
-  // places that are open contract questions — inline i18n label maps on three
-  // published platform pages (#5728) and the record picker's declared-but-unread
-  // `displayField` (#5775) — so gating today would fail the platform's own pages
-  // to enforce declarations the platform does not keep. The error upgrade is a
-  // separate step, once the warning-period inventory is empty.
-  //
-  // #5775 settled the record picker's half: `displayField` is retired in favour
-  // of the `labelField` the renderer actually reads. Its claim that "the rest of
-  // the keys the renderers honour are declared" did NOT hold — #6776 found five
-  // more (`page:header` `recordChrome`/`showStar`/`showCopyId`,
-  // `page:accordion.variant`, and the tab strip's visual style, whose declared
-  // spelling `page:tabs.type` collided with the component node's own dispatch
-  // key and so was unauthorable in the flat and JSX carriers). All five are
-  // declared as of #6776, the last as the renamed `tabStyle`. What remains
-  // before the error upgrade is #5728 and two page rewrites.
+  // Gating since #23026, for ONE class: a `retiredKey()` tombstone's verdict is
+  // an `error`, so `os validate`, `os build` and `os lint` refuse a retired
+  // prop with its prescription. Every other finding stays a `warning`. #5068's
+  // first step was advisory on purpose — wiring the parse is the precondition
+  // for enforcement, not the enforcement (#5020, one surface over) — and the
+  // error upgrade was to be its own step once the warning-period inventory was
+  // empty. Its blockers (#5728, #5775, #6776's undeclared props, two page
+  // rewrites) are all closed, and the inventory measured 0. The rule's module
+  // header records the measurement and why the other classes stay advisory.
   {
     name: 'validateComponentProps',
-    tier: 'advisory',
+    tier: 'gating',
     input: 'normalized',
     commands: ALL,
     source: 'packages/lint/src/validate-component-props.ts',
diff --git a/packages/lint/src/validate-component-props.test.ts b/packages/lint/src/validate-component-props.test.ts
index 5ecf6ddf37c..6c29afcd19d 100644
--- a/packages/lint/src/validate-component-props.test.ts
+++ b/packages/lint/src/validate-component-props.test.ts
@@ -77,26 +77,26 @@ describe('validateComponentProps — undeclared keys', () => {
     expect(findings).toEqual([]);
   });
 
-  // #20758 — `PageHeaderProps.breadcrumb` is a retiredKey tombstone. A page is
-  // never hard-refused for carrying it: this rule is the door where an author
-  // meets the prescription, and every finding it files is a WARNING.
-  it('reports a retired page-header `breadcrumb` as a warning carrying the prescription, for `true` and `false`', () => {
+  // #20758 — `PageHeaderProps.breadcrumb` is a retiredKey tombstone. This rule
+  // is the door where an author meets the prescription, and since #23026 a
+  // retired key is the one class it refuses: an ERROR, whatever the value.
+  it('refuses a retired page-header `breadcrumb` as an error carrying the prescription, for `true` and `false`', () => {
     for (const breadcrumb of [true, false]) {
       const findings = validateComponentProps(
         stackWith([{ type: 'page:header', properties: { title: 'T', breadcrumb } }]),
       );
       expect(findings, `breadcrumb: ${breadcrumb}`).toHaveLength(1);
       const [f] = findings;
-      expect(f.severity).toBe('warning');
+      expect(f.severity).toBe('error');
       expect(f.path).toBe('pages[0].regions[0].components[0].properties.breadcrumb');
       expect(f.message).toContain('`page:header` property `breadcrumb` was removed in @objectstack/spec 17');
     }
   });
 
   // #21589 — an `object-master-detail-form` detail entry's `sortField` is a
-  // retiredKey tombstone, one array level down. The same door, the same
-  // warning: the finding names the entry's key, and the page is never refused.
-  it('reports a retired detail-entry `sortField` as a warning carrying the prescription, at the entry\'s key', () => {
+  // retiredKey tombstone, one array level down. The same door and, since
+  // #23026, the same refusal: an error that names the entry's key.
+  it('refuses a retired detail-entry `sortField` as an error carrying the prescription, at the entry\'s key', () => {
     const findings = validateComponentProps(
       stackWith([
         {
@@ -113,7 +113,7 @@ describe('validateComponentProps — undeclared keys', () => {
     );
     expect(findings).toHaveLength(1);
     const [f] = findings;
-    expect(f.severity).toBe('warning');
+    expect(f.severity).toBe('error');
     expect(f.rule).toBe(COMPONENT_PROPS_INVALID);
     expect(f.path).toBe('pages[0].regions[0].components[0].properties.details.1.sortField');
     expect(f.message).toContain('`object-master-detail-form` property `details[].sortField` was removed in @objectstack/spec 17');
@@ -424,7 +424,7 @@ describe('validateComponentProps — value verdicts', () => {
     );
     const retired = invalid(findings).filter((f) => f.path.endsWith('.displayField'));
     expect(retired).toHaveLength(1);
-    expect(retired[0].severity).toBe('warning');
+    expect(retired[0].severity).toBe('error');
     expect(retired[0].message).toMatch(/removed in @objectstack\/spec 17\.0\.0[\s\S]*`labelField`/);
   });
 
@@ -647,8 +647,8 @@ describe('validateComponentProps — object-* blocks are dispatched (#7751)', ()
     expect(f.where).toBe('page "probe_page" · object-grid');
     expect(f.message).toContain('`filters`');
     expect(f.message).toContain('Did you mean `filters` → `filter`?');
-    // Warning tier only — the error upgrade stays gated on the #5068
-    // inventory; this card did not move that gate (ruling 2026-08-12).
+    // Warning tier only — an undeclared key is not the retired-key class
+    // #23026 moved to `error`.
     expect(invalid(findings)).toEqual([]);
   });
 
@@ -743,10 +743,10 @@ describe('validateComponentProps — reads the post-conversion (normalized) tier
 });
 
 describe('validateComponentProps — wiring', () => {
-  it('is registered as an advisory rule on all three authoring commands', () => {
+  it('is registered as a gating rule on all three authoring commands (#23026: a retired key is an error)', () => {
     const entry = AUTHORING_RULES.find((r) => r.name === 'validateComponentProps');
     expect(entry).toBeDefined();
-    expect(entry?.tier).toBe('advisory');
+    expect(entry?.tier).toBe('gating');
     expect([...(entry?.commands ?? [])].sort()).toEqual(['build', 'lint', 'validate']);
   });
 
@@ -761,6 +761,144 @@ describe('validateComponentProps — wiring', () => {
   });
 });
 
+/**
+ * #23026 — the error upgrade the module header planned, for ONE class: a value
+ * verdict a `retiredKey()` tombstone raises is an `error`; every other finding
+ * stays a `warning`. Asserted on rule id, severity and path — the prescription
+ * is asserted as CARRIED (read back from the spec's own tombstone), never as
+ * prose copied here.
+ */
+describe('validateComponentProps — a retired key is an error, nothing else is (#23026)', () => {
+  /** The prescription the spec's own tombstone raises for `type.key`, read from the schema. */
+  const prescription = (type: string, key: string): string => {
+    const schema = (ComponentPropsMap as unknown as Record<string, { safeParse: (v: unknown) => { error?: { issues: Array<{ path: PropertyKey[]; message: string }> } } }>)[type];
+    const issue = schema.safeParse({ [key]: 'probe' }).error?.issues.find((i) => i.path.length === 1 && i.path[0] === key);
+    expect(issue, `${type}.${key} raises no issue of its own`).toBeDefined();
+    return issue!.message;
+  };
+
+  it('refuses the card\'s specimen — `object-grid` `defaultFilters` — as an error carrying its prescription', () => {
+    const findings = validateComponentProps(
+      stackWith([{
+        type: 'object-grid',
+        properties: {
+          objectName: 'task',
+          defaultFilters: [{ field: 'status', operator: 'equals', value: 'open' }],
+        },
+      }]),
+    );
+    expect(findings.map((f) => [f.rule, f.severity, f.path])).toEqual([
+      [COMPONENT_PROPS_INVALID, 'error', 'pages[0].regions[0].components[0].properties.defaultFilters'],
+    ]);
+    expect(findings[0].message).toContain(prescription('object-grid', 'defaultFilters'));
+  });
+
+  /**
+   * Every top-level tombstone in the map, found from the SCHEMA GRAPH (a key
+   * whose schema is `optional` over `never`), not from the issue shape the
+   * rule reads — so a tombstone whose verdict stopped classifying reds here,
+   * whichever row it sits on.
+   */
+  it('refuses every top-level tombstoned prop in ComponentPropsMap as an error, at its own key', () => {
+    type Node = { _zod: { def: { type: string; innerType?: Node } } };
+    const tombstones = Object.entries(ComponentPropsMap).flatMap(([type, schema]) => {
+      const shape = (schema as unknown as { shape?: Record<string, Node> }).shape ?? {};
+      return Object.entries(shape)
+        .filter(([, node]) => node._zod.def.type === 'optional' && node._zod.def.innerType?._zod.def.type === 'never')
+        .map(([key]) => [type, key] as const);
+    });
+    // Anti-vacuity: the walk reaches the card's specimen and a fair number besides.
+    expect(tombstones).toContainEqual(['object-grid', 'defaultFilters']);
+    expect(tombstones.length).toBeGreaterThan(30);
+    const missed = tombstones.filter(([type, key]) => {
+      const findings = validateComponentProps(stackWith([{ type, dataSource: { object: 'task' }, properties: { [key]: 'probe' } }]));
+      const at = findings.filter((f) => f.path === `pages[0].regions[0].components[0].properties.${key}`);
+      return !(at.length === 1 && at[0].rule === COMPONENT_PROPS_INVALID && at[0].severity === 'error');
+    });
+    expect(missed).toEqual([]);
+  });
+
+  it('refuses a retired ELEMENT\'s bag (`user:profile`) as an error — the same tombstone shape, one grain wider', () => {
+    const findings = validateComponentProps(stackWith([{ type: 'user:profile', properties: {} }]));
+    expect(findings.map((f) => [f.rule, f.severity, f.path])).toEqual([
+      [COMPONENT_PROPS_INVALID, 'error', 'pages[0].regions[0].components[0].properties'],
+    ]);
+  });
+
+  it('refuses a tombstone inside a union arm when that arm is the only one judging keys (`publicPicker`)', () => {
+    const findings = validateComponentProps(
+      stackWith([{
+        type: 'object-form',
+        properties: { objectName: 'task', sections: [{ label: 'S', fields: ['name', { field: 'owner', publicPicker: true }] }] },
+      }]),
+    );
+    expect(findings.map((f) => [f.rule, f.severity, f.path])).toEqual([
+      [COMPONENT_PROPS_INVALID, 'error', 'pages[0].regions[0].components[0].properties.sections.0.fields.1'],
+    ]);
+  });
+
+  it('leaves that union verdict a warning when the same arm also rejects a value for another reason', () => {
+    const findings = validateComponentProps(
+      stackWith([{
+        type: 'object-form',
+        properties: { objectName: 'task', sections: [{ label: 'S', fields: [{ field: 'owner', publicPicker: true, colSpan: 'wide' }] }] },
+      }]),
+    );
+    expect(findings.map((f) => [f.rule, f.severity])).toEqual([[COMPONENT_PROPS_INVALID, 'warning']]);
+  });
+
+  it('classifies per issue: a retired key beside a wrongly-typed prop is one error and one warning', () => {
+    const findings = validateComponentProps(
+      stackWith([{ type: 'object-grid', properties: { objectName: 'task', defaultFilters: [], pageSize: 'ten' } }]),
+    );
+    const base = 'pages[0].regions[0].components[0].properties';
+    expect(findings.map((f) => [f.rule, f.severity, f.path])).toEqual([
+      [COMPONENT_PROPS_INVALID, 'error', `${base}.defaultFilters`],
+      [COMPONENT_PROPS_INVALID, 'warning', `${base}.pageSize`],
+    ]);
+  });
+
+  // The two closed-set refusals that landed beside this change reach the rule
+  // as `component-props-invalid` too, and are not the retired-key class.
+  it('keeps a url action\'s refused `target` scheme a warning', () => {
+    const findings = validateComponentProps(
+      stackWith([{ type: 'element:button', properties: { label: 'Go', action: { type: 'url', target: 'javascript:alert(1)' } } }]),
+    );
+    expect(findings.map((f) => [f.rule, f.severity, f.path])).toEqual([
+      [COMPONENT_PROPS_INVALID, 'warning', 'pages[0].regions[0].components[0].properties.action.target'],
+    ]);
+  });
+
+  it('keeps a `record:details` section `count` whose heading binds no hole a warning', () => {
+    const findings = validateComponentProps(
+      stackWith([{ type: 'record:details', properties: { sections: [{ label: 'Tags', fields: ['tags'], count: { field: 'tags' } }] } }]),
+    );
+    expect(findings.length).toBeGreaterThan(0);
+    expect(findings.every((f) => f.rule === COMPONENT_PROPS_INVALID && f.severity === 'warning')).toBe(true);
+  });
+
+  it('keeps an undeclared key and a missing `dataSource.object` binding warnings', () => {
+    const findings = validateComponentProps(
+      stackWith([
+        { type: 'page:header', properties: { title: 'T', titel: 'typo' } },
+        { type: 'element:number', properties: { aggregate: 'count' } },
+      ]),
+    );
+    expect(findings.map((f) => [f.rule, f.severity])).toEqual([
+      [COMPONENT_PROPS_UNKNOWN_KEY, 'warning'],
+      [COMPONENT_PROPS_INVALID, 'warning'],
+    ]);
+  });
+
+  it('reaches the shared pipeline as an error — the run `os validate` / `os build` / `os lint` refuse on', () => {
+    const findings = runAuthoringRules('validate', {
+      normalized: stackWith([{ type: 'object-grid', properties: { objectName: 'task', defaultFilters: [] } }]) as never,
+    });
+    const mine = findings.filter((f) => f.rule.startsWith('component-props'));
+    expect(mine.map((f) => [f.rule, f.severity])).toEqual([[COMPONENT_PROPS_INVALID, 'error']]);
+  });
+});
+
 /**
  * #4001 batch A closed all 31 `ComponentPropsMap` shapes, including two UNION
  * ARMS. An arm's rejection travels a different road out of zod than an object's,
diff --git a/packages/lint/src/validate-component-props.ts b/packages/lint/src/validate-component-props.ts
index 5c1af337036..f986c5ad729 100644
--- a/packages/lint/src/validate-component-props.ts
+++ b/packages/lint/src/validate-component-props.ts
@@ -48,38 +48,59 @@
  * author's view — and without this file needing to know which posture the spec
  * is at.
  *
- * ## Why WARNING, and only warning, in this PR
+ * ## Severity — a RETIRED key is an `error`, every other finding a `warning`
  *
- * Wiring the parse is the precondition for enforcement, not the enforcement
- * (the #5020 lesson, one surface over). The corpus this landed on carries live
- * violations that are open contract questions, not authoring mistakes:
- * `I18nLabelSchema` is a plain `z.string()` while three published platform
- * pages author inline `{ en, 'zh-CN', … }` maps that objectui resolves
- * (#5728), and the record picker declared a required `displayField` that no
- * renderer reads while honouring an undeclared `labelField` (#5775). Gating
- * those would fail the platform's own pages to enforce declarations the
- * platform does not itself keep. So every finding here is advisory, the
- * warning-period inventory is the acceptance baseline for the error upgrade,
- * and the upgrade is its own step once the inventory is empty.
+ * Wiring the parse was the precondition for enforcement, not the enforcement
+ * (the #5020 lesson, one surface over), so this rule landed advisory: the
+ * corpus it landed on carried live violations that were open contract
+ * questions, not authoring mistakes — inline `{ en, 'zh-CN', … }` label maps
+ * against a plain-string `I18nLabelSchema` on three platform pages (#5728), the
+ * record picker's required-but-unread `displayField` (#5775), five props the
+ * renderers read and the map did not declare (#6776), and two page rewrites
+ * (`page:card.visible` → `visibleWhen`; #5776's tab `key` → `value`). Gating
+ * then would have failed the platform's own pages to enforce declarations the
+ * platform did not keep. The plan was recorded here: the warning-period
+ * inventory is the acceptance baseline for the error upgrade, and the upgrade
+ * is its own step once the inventory is empty. Every blocker above is closed.
  *
- * #5775 settled most of the spec side of that inventory — four keys nothing read
- * are tombstoned with ADR-0087 conversions. Its stronger claim, that every key
- * the renderers honour is now declared, was **incomplete**: #6776 re-counted
- * against objectui `origin/main` and found five more author-facing props the
- * renderers read and this map did not declare — `page:header`'s
- * `recordChrome` / `showStar` / `showCopyId`, `page:accordion.variant`, and the
- * tab strip's visual style, which the spec did declare but under a spelling
- * (`page:tabs.type`) that collides with a page component's own dispatch key and
- * is therefore unauthorable in the flat and JSX carriers. #6776 declares the
- * four and renames the fifth to the `tabStyle` every carrier can express. Both
- * cards are named here rather than only in a changelog because THIS comment is
- * the inventory the error upgrade is measured against, and a count that reports
- * itself complete while it is not is how the second half went unnoticed for a
- * release.
+ * #23026 took that step for ONE class: a value verdict raised by a
+ * `retiredKey()` tombstone (`shared/retired-key.ts`, `@objectstack/spec`). A
+ * tombstone keeps a key declared only so that writing it raises the
+ * prescription, so reporting it as advice had `os validate` print
+ * "✓ Validation passed" over a key the ADR-0087 conversion registry tells
+ * authors is refused. The inventory, measured before the upgrade at
+ * objectstack `21c86444e`: `os validate` over `examples/app-crm`, `app-todo`,
+ * `app-multi-package` and `app-showcase`, and this rule over the five shipped
+ * pages outside them (`platform-objects` ×3, `plugin-approvals`,
+ * `qa/downstream-contract`); `packages/apps/*` and the `create-objectstack`
+ * template author no page. Retired-key findings: 0. Every other finding of
+ * this rule: 0 as well.
  *
- * What stands between this rule and `error` is now #5728 and two page rewrites
- * (`page:card.visible` → the ADR-0089 component-level `visibleWhen`; #5776's tab
- * `key` → `value`), not the props map.
+ * The class is read off the ISSUE, never off its text ({@link isRetiredKeyVerdict}):
+ *
+ * - the tombstone's own issue, `invalid_type` expecting `never` — the shape a
+ *   `retiredKey()` raises, and the discriminator the spec's own flow-node
+ *   refusals use. A retired ELEMENT's row (`retiredComponentProps` in
+ *   `ui/component.zod.ts`: `z.never` over the whole bag, with the element's
+ *   prescription) raises the same shape and is the same class;
+ * - inside a collapsed `invalid_union`, when exactly one arm raised tombstone
+ *   issues and nothing else — the one-arm rule of
+ *   {@link unrecognizedKeysFromUnionArm}, for the same reason. It is live on
+ *   `object-form` / `object-master-detail-form` `sections[].fields[]`, whose
+ *   object arm tombstones `publicPicker`.
+ *
+ * What stays a `warning`, deliberately: a value rejected for any other reason
+ * (a wrong type, a missing required prop, a closed-set refusal such as a url
+ * action's `target` scheme or a `record:details` section's `count`), a
+ * retired enum VALUE (`enumWithRetiredValues` raises an enum issue, not a
+ * tombstone), an undeclared key, and the missing `dataSource.object` binding.
+ * Their inventory above (0) is the next step's baseline; moving them is a
+ * decision of its own, not a rider on this one.
+ *
+ * Where it refuses: the three CLI doors — `os validate`, `os build`, `os lint`
+ * — run every gating rule. The runtime publish door (the Studio, REST and MCP
+ * write path) does not run this rule (`surfaces` in `authoring-rules.ts`), so a
+ * page saved there is not refused for a retired key.
  *
  * ## Unregistered types are SKIPPED — a required semantic, not leniency
  *
@@ -115,12 +136,12 @@ export const COMPONENT_PROPS_UNKNOWN_KEY = 'component-props-unknown-key';
 export const COMPONENT_PROPS_INVALID = 'component-props-invalid';
 
 /**
- * Advisory on every finding this rule emits — see the module header. The type
- * is a single literal rather than a union so the tier claim in
- * `authoring-rules.ts` is provable from this file's source, which is exactly
- * what `authoring-rule-wiring.test.ts` reads it for.
+ * `error` for a retired key ({@link isRetiredKeyVerdict}), `warning` for every
+ * other finding — see the module header. Emitting `error` makes the rule
+ * `gating` in `authoring-rules.ts`, which `authoring-rule-wiring.test.ts`
+ * verifies against this file's source.
  */
-export type ComponentPropsSeverity = 'warning';
+export type ComponentPropsSeverity = 'error' | 'warning';
 
 export interface ComponentPropsFinding {
   severity: ComponentPropsSeverity;
@@ -226,6 +247,42 @@ function unrecognizedKeysFromUnionArm(issue: LintZodIssue): LintZodIssue | undef
   return found;
 }
 
+/**
+ * A `retiredKey()` tombstone's own issue: `z.never` refuses every value as
+ * `invalid_type` expecting `never`, carrying the prescription as its message.
+ * `expected` is read structurally, as the spec's flow-node refusals read it,
+ * because {@link LintZodIssue} declares only the fields the renderer needs.
+ */
+function isTombstoneIssue(issue: LintZodIssue): boolean {
+  return issue.code === 'invalid_type' && (issue as { readonly expected?: unknown }).expected === 'never';
+}
+
+/**
+ * Is this value verdict a RETIRED key the author wrote — the class this rule
+ * refuses as an `error` (module header, "Severity")?
+ *
+ * Directly, when the issue is the tombstone's own. Inside a collapsed
+ * `invalid_union`, only under the one-arm rule {@link unrecognizedKeysFromUnionArm}
+ * states: exactly one arm raised tombstone issues, and that arm raised nothing
+ * else. Two arms each refusing a retired key, or one arm refusing a retired key
+ * beside a value it rejects for another reason, do not say which shape the
+ * author meant, so the verdict stays the ordinary `warning` — `describeIssue`
+ * still prints every arm's message, the prescription included.
+ */
+function isRetiredKeyVerdict(issue: LintZodIssue): boolean {
+  if (isTombstoneIssue(issue)) return true;
+  if (issue.code !== 'invalid_union') return false;
+  const arms = issue.errors;
+  if (!arms || arms.length === 0) return false;
+  let found = false;
+  for (const arm of arms) {
+    if (!arm.some(isRetiredKeyVerdict)) continue;
+    if (found || !arm.every(isRetiredKeyVerdict)) return false;
+    found = true;
+  }
+  return found;
+}
+
 export function validateComponentProps(stack: AnyRec): ComponentPropsFinding[] {
   const findings: ComponentPropsFinding[] = [];
   if (!isRec(stack)) return findings;
@@ -349,6 +406,24 @@ export function validateComponentProps(stack: AnyRec): ComponentPropsFinding[] {
           }
           continue;
         }
+        const subject = `${at.slice(base.length + 1) || 'properties'}: ${describeIssue(issue, props)}`;
+        // A retired key is refused; it is the one `error` this rule files. Its
+        // fix is the prescription the message already carries, so the hint
+        // never offers the other branch below — re-declaring a retired key in
+        // the schema would undo its retirement.
+        if (isRetiredKeyVerdict(issue)) {
+          findings.push({
+            severity: 'error',
+            rule: COMPONENT_PROPS_INVALID,
+            where,
+            path: at,
+            message: `${subject} — a retired key is refused, so this stack does not pass until it is gone`,
+            hint:
+              `Apply the prescription above: \`${type}\`'s props schema keeps a retired key only to refuse ` +
+              'it, so the fix is the rename or removal it names, never a schema change.',
+          });
+          continue;
+        }
         findings.push({
           severity: 'warning',
           rule: COMPONENT_PROPS_INVALID,
@@ -358,9 +433,7 @@ export function validateComponentProps(stack: AnyRec): ComponentPropsFinding[] {
           // advisory posture it used to explain (judged here as a warning, and
           // the props bag is not parsed on the storage path) is the verdict's
           // consequence and rides the message.
-          message:
-            `${at.slice(base.length + 1) || 'properties'}: ${describeIssue(issue, props)} — ` +
-            'nothing refuses it today, so the renderer receives the props as written',
+          message: `${subject} — nothing refuses it today, so the renderer receives the props as written`,
           hint:
             `Give \`${type}\` props its schema accepts (ComponentPropsMap, @objectstack/spec/ui) — the ` +
             'rejection above names what it expects — or, if the component really does honour what is ' +
diff --git a/packages/lint/src/validate-page-field-bindings.ts b/packages/lint/src/validate-page-field-bindings.ts
index ad2e6568a35..d6448e1b5e3 100644
--- a/packages/lint/src/validate-page-field-bindings.ts
+++ b/packages/lint/src/validate-page-field-bindings.ts
@@ -230,11 +230,13 @@ export const COMPONENT_FIELD_SPECS: Readonly<Record<string, ComponentFieldSpec>>
   // NAME against the object) is not the question a retired key raises (commit cd584d559).
   //
   // A non-conformant page that writes one anyway is not left unattended: the
-  // #5068 props gate reports the key with its rename/delete prescription. That
-  // gate is advisory and CLI-only and lives in a different registry
-  // (`authoring-rules`) from this suite, so it neither precedes nor suppresses
-  // this rule — what these two entries actually added was a SECOND finding,
-  // saying a field named by a key that no longer exists does not exist either.
+  // #5068 props gate refuses the key as an `error` at `os validate` /
+  // `os build` / `os lint`, with its rename/delete prescription (it stays
+  // advisory for every other finding). That gate is CLI-only and lives in a
+  // different registry (`authoring-rules`) from this suite, so it neither
+  // precedes nor suppresses this rule — what these two entries actually added
+  // was a SECOND finding, saying a field named by a key that no longer exists
+  // does not exist either.
   // The prescription is the useful half; this half was noise on top of it.
   'element:record_picker': { props: ['labelField'] },
 };
diff --git a/packages/spec/src/conversions/registry.ts b/packages/spec/src/conversions/registry.ts
index 96d69e4b513..4f65f89a760 100644
--- a/packages/spec/src/conversions/registry.ts
+++ b/packages/spec/src/conversions/registry.ts
@@ -5133,8 +5133,10 @@ const pageHeaderSubtitleAlias: MetadataConversion = {
  * conversion can honour at a nested site, not only at region level.
  *
  * All three are **retired from the load path**: each key is tombstoned in
- * `ui/component.zod.ts`, so the loader rejects it loudly with the prescription
- * and only `os migrate meta` lists the mechanical edits for existing sources.
+ * `ui/component.zod.ts`, so `os validate`, `os build` and `os lint` refuse it
+ * with the prescription (the component-props gate, `@objectstack/lint`; the
+ * load path keeps the open `properties` bag as written) and only
+ * `os migrate meta` lists the mechanical edits for existing sources.
  */
 const RECORD_PICKER_COMPONENT_TYPE = 'element:record_picker';
 
@@ -5832,7 +5834,9 @@ const inlineActionApiParamsToBodyExtra: MetadataConversion = {
  * component's inner `type` (an action's `type: 'url'`, a tab item's fields)
  * into a rewrite target: only `properties.type` on a node whose own `type` is
  * `page:tabs` moves. The tombstone still carries the refusal at the authoring
- * site (`tsc`) and at load (the parse), whatever the walk reached.
+ * site (`tsc`) and at `os validate` / `os build` / `os lint`, where the
+ * component-props gate refuses it as an `error` (the load path keeps the open
+ * `properties` bag as written), whatever the walk reached.
  *
  * `retiredFromLoadPath: true`: no alias window, deliberately. The tombstone owns
  * the refusal; this entry exists so `spec-changes.json`, the upgrade guide and
@@ -8025,8 +8029,12 @@ const translationPerAppSettingsRemoved: MetadataConversion = {
  * Reach: the literal defaults the narrowed gates judge — a `time` field's
  * (`objects[]`, `objectExtensions[]`) and an action param typed `time`
  * (`actions[]`, `objects[].actions[]`, an `element:button`'s inline action).
- * Retired from the load path: an author is refused at parse, and data at rest
- * and `os migrate meta` replay it.
+ * Retired from the load path: an author is refused at parse — except on an
+ * `element:button`'s inline action, which sits in the open `properties` bag the
+ * load path keeps as written, where the refusal is an advisory
+ * `component-props-invalid` finding at `os validate` / `os build` / `os lint`
+ * (the component-props gate, `@objectstack/lint`) — and data at rest and
+ * `os migrate meta` replay it.
  */
 const timeDefaultUtcSuffixDropped: MetadataConversion = {
   id: 'time-default-utc-suffix-dropped',
@@ -8322,8 +8330,12 @@ const translationComponentSubmitLabelRemoved: MetadataConversion = {
  * positions the component-props gate judges. `variant` on any other component
  * type is that component's own vocabulary and is never read here.
  *
- * `retiredFromLoadPath`: an author is refused at parse with the prescription
- * rather than silently rewritten; stored rows replay it at rehydration
+ * `retiredFromLoadPath`: an author is not silently rewritten — `os validate`,
+ * `os build` and `os lint` report an old spelling as an advisory
+ * `component-props-invalid` finding carrying the prescription (the
+ * component-props gate, `@objectstack/lint`: a retired enum value is a value
+ * verdict, a warning; the load path keeps the open `properties` bag as
+ * written); stored rows replay it at rehydration
  * (`applyConversionsToStoredItem`) and `os migrate meta` lists the edit for
  * existing sources. Idempotent by construction: the rewrite's output is
  * outside its own input set.
@@ -9818,7 +9830,8 @@ function gridFilterHasContent(value: unknown): boolean {
  * Zero authored occurrences in this repository (the showcase pins it at zero),
  * so the entry exists for stored `sys_metadata` rows and for authors outside
  * the repo. Retired from the load path: an author writing the key is refused
- * at the parse with the prescription.
+ * by `os validate`, `os build` and `os lint` (the component-props gate) with
+ * the prescription.
  */
 const objectGridDefaultFiltersRemoved: MetadataConversion = {
   id: 'object-grid-default-filters-removed',
@@ -10606,8 +10619,10 @@ const objectKanbanQuickAddRemoved: MetadataConversion = {
  * nothing fills the slot. The console draws the navigation trail once, in the
  * shell (`@object-ui/app-shell` `AppHeader`, inside `/apps/:appName/*`), so the
  * retirement takes the key away rather than building a second trail. The
- * tombstone on `PageHeaderProps` refuses it for a live author (advisory, via
- * the props lint: `PageComponentSchema.properties` is an open bag).
+ * tombstone on `PageHeaderProps` refuses it for a live author: `os validate`,
+ * `os build` and `os lint` refuse it as an `error` with the prescription (the
+ * component-props gate, `@objectstack/lint`; the load path keeps the open
+ * `properties` bag as written).
  *
  * **A delete of both values.** `true` and `false` go alike: neither ever drew
  * a trail, so there is no value to preserve and no rewrite target. The one
@@ -13548,8 +13563,10 @@ const dashboardWidgetChartConfigStructureRemoved: MetadataConversion = {
  * `sort_field` (`:874`). An authored value changed nothing on that console, so
  * deleting it preserves observed behaviour exactly; the line order is kept by
  * the child object's own field, which the entry's tombstone names. The
- * tombstone refuses the key for a live author (advisory, via the props lint:
- * `PageComponentSchema.properties` is an open bag).
+ * tombstone refuses the key for a live author: `os validate`, `os build` and
+ * `os lint` refuse it as an `error` with the prescription (the component-props
+ * gate, `@objectstack/lint`; the load path keeps the open `properties` bag as
+ * written).
  *
  * ⚠️ Scoped by component `type` and by POSITION — `properties.details[]` of an
  * `object-master-detail-form` — never by key name: `sortField` is an ordinary
diff --git a/packages/spec/src/migrations/entries/retired-keys/18.ui__PageHeaderProps__breadcrumb.ts b/packages/spec/src/migrations/entries/retired-keys/18.ui__PageHeaderProps__breadcrumb.ts
index 553e2574b5e..3fc620b9626 100644
--- a/packages/spec/src/migrations/entries/retired-keys/18.ui__PageHeaderProps__breadcrumb.ts
+++ b/packages/spec/src/migrations/entries/retired-keys/18.ui__PageHeaderProps__breadcrumb.ts
@@ -14,8 +14,9 @@
 // ⭐ RETIRED-DEFAULT RESIDUE: not owed, although the key carried
 // `.default(true)`. The default was never materialized: a page parses its
 // component `properties` as an open bag, and this row is parsed only by the
-// advisory props lint, which writes nothing back — so no released toolchain
-// emitted `breadcrumb: true` into an artifact nobody authored.
+// props lint (advisory in every release that shipped the default), which
+// writes nothing back — so no released toolchain emitted `breadcrumb: true`
+// into an artifact nobody authored.
 //
 // Registered under 18, not 17: v17.0.0 was cut before this landed, so the
 // removal ships on the 17.x line (launch-window convention: accept-set
diff --git a/packages/spec/src/ui/component.zod.ts b/packages/spec/src/ui/component.zod.ts
index a38da962ff9..12adf3a7859 100644
--- a/packages/spec/src/ui/component.zod.ts
+++ b/packages/spec/src/ui/component.zod.ts
@@ -281,10 +281,10 @@ import { INLINE_GRID_SORT_FIELD_LIST } from '../data/inline-grid-sort-fields';
 //     `saveMetaItem` / REST `/meta` write still stores an unvalidated props bag
 //     (#4463's fourth wall). That is recorded, not fixed, by #5068.
 //
-// The gate is WARNING-level in this first step. The live corpus violated these
+// The gate was WARNING-level in this first step. The live corpus violated these
 // declarations in places that were open contract questions rather than
-// authoring mistakes, and the inventory is the acceptance baseline for the
-// error upgrade. Two of the three entries are now cleared:
+// authoring mistakes, and the inventory was the acceptance baseline for the
+// error upgrade. Two of the three entries were cleared here:
 //
 //  - #5775 declared the keys objectui's renderers honour and tombstoned the
 //    four nothing read.
@@ -296,9 +296,11 @@ import { INLINE_GRID_SORT_FIELD_LIST } from '../data/inline-grid-sort-fields';
 //    same ruling and moved onto it. That retired all 42 `component-props-invalid`
 //    findings this gate reported on the platform pages (34 label + 8 content).
 //
-// What remains before the upgrade to error is the page rewrites
-// (`page:card.visible` → the component-level `visibleWhen`, #5776's tab `key`
-// → `value`), not a declaration in this file.
+// The page rewrites (`page:card.visible` → the component-level `visibleWhen`,
+// #5776's tab `key` → `value`) closed the third, and #23026 took the upgrade
+// for one class once the inventory measured empty: a `retiredKey()`
+// tombstone's verdict is an `error` at `os validate` / `os build` / `os lint`.
+// Every other finding of the gate stays a warning (#23147 carries the rest).
 //
 // ⚠️ One inventory item batch A ADDED rather than closed, because measuring the
 // renderers turned it up: objectui's Studio block designer publishes inputs that
@@ -651,8 +653,9 @@ export const PageHeaderProps = strictObject({
    * inside `/apps/:appName/*`), so a page-level renderer would duplicate it
    * rather than supply something missing. The default `true` was never
    * materialized into a built artifact: `PageComponentSchema.properties` is an
-   * open bag, and this row is parsed only by the advisory props lint, which
-   * writes nothing back — so no retired-default residue stage is owed.
+   * open bag, and this row is parsed only by the props lint (advisory in every
+   * release that shipped the default), which writes nothing back — so no
+   * retired-default residue stage is owed.
    *
    * Stored and built pages that carry the key (`true` or `false`) are stripped
    * by the D2 conversion `page-header-breadcrumb-removed`, with a notice.
@@ -4844,8 +4847,11 @@ export type ElementRepeaterPropsParsed = z.infer<typeof ElementRepeaterPropsSche
  * inventory, exactly like the #5068 → #4001-batch-A sequence above.
  *
  * The warning→error upgrade is untouched by this section: findings on these
- * entries are advisory, still gated on the #5068 inventory (the ruling:
- * 「warning 层先行,error 升级仍以 inventory 为闸,本裁定不改那个闸」).
+ * entries were advisory, gated on the #5068 inventory (the ruling:
+ * 「warning 层先行,error 升级仍以 inventory 为闸,本裁定不改那个闸」). Once
+ * that inventory measured empty, #23026 made one class an `error` — a
+ * `retiredKey()` tombstone's verdict, such as a retired key these rows carry;
+ * every other finding on them stays advisory (#23147 carries the rest).
  *
  * Deliberately NOT declared, each with its reason:
  *
diff --git a/packages/spec/src/ui/element-flat-binding-retirement.test.ts b/packages/spec/src/ui/element-flat-binding-retirement.test.ts
index 8bc46e60f32..6ff894e35ee 100644
--- a/packages/spec/src/ui/element-flat-binding-retirement.test.ts
+++ b/packages/spec/src/ui/element-flat-binding-retirement.test.ts
@@ -198,7 +198,8 @@ describe('the binding — the one door the three elements read', () => {
   });
 
   it('never hard-refuses an existing page: the page parse still accepts a node carrying a flat key', () => {
-    // The open `properties` bag is the props lint's to judge (advisory), not the page parse's.
+    // The open `properties` bag is the props lint's to judge (a retired flat key is an `error`
+    // at `os validate` / `os build` / `os lint`), not the page parse's.
     const r = PageComponentSchema.safeParse({ type: 'element:repeater', properties: { object: 'deal' } });
     expect(r.success).toBe(true);
   });
diff --git a/packages/spec/src/ui/form-field-public-picker-retirement.test.ts b/packages/spec/src/ui/form-field-public-picker-retirement.test.ts
index e4bb7fb1f11..a947f40e1f1 100644
--- a/packages/spec/src/ui/form-field-public-picker-retirement.test.ts
+++ b/packages/spec/src/ui/form-field-public-picker-retirement.test.ts
@@ -315,6 +315,10 @@ describe('tree-scoped absence: no form field inside the declared radius still au
     // The REST strip pin authors it on a STORED pre-retirement row, the exact
     // row the old opt-in would have kept, to prove the strip is unconditional.
     'packages/rest/src/public-form-routes.test.ts',
+    // The props-lint pin authors it on an `object-form` field to prove the
+    // component-props gate refuses a tombstone inside a union arm as an error
+    // at `os validate` / `os build` / `os lint`.
+    'packages/lint/src/validate-component-props.test.ts',
     // This pin names the key to assert its absence.
     THIS_FILE,
   ]);
diff --git a/packages/spec/src/ui/master-detail-detail-sort-field-retirement.test.ts b/packages/spec/src/ui/master-detail-detail-sort-field-retirement.test.ts
index b55f882800a..36274034120 100644
--- a/packages/spec/src/ui/master-detail-detail-sort-field-retirement.test.ts
+++ b/packages/spec/src/ui/master-detail-detail-sort-field-retirement.test.ts
@@ -19,8 +19,9 @@
  *      carries the prescription, which names the derived field set from its
  *      one declaration (`data/inline-grid-sort-fields.ts`), and the key's
  *      input type is `never`. `PageComponentSchema.properties` is an open bag,
- *      so the props schema is reached by the advisory props lint and never by
- *      the page parse: an existing page is never hard-refused.
+ *      so the props schema is reached by the props lint — which refuses this
+ *      tombstone as an `error` at `os validate` / `os build` / `os lint` — and
+ *      never by the page parse: an existing page is never hard-refused at load.
  *   2. D2 conversion `object-master-detail-form-detail-sort-field-removed`
  *      (step 18), a strip scoped by component type and by position, retired
  *      from the load path: a stored or built page replays clean, with a notice.
@@ -443,7 +444,7 @@ describe('tree-scoped absence: nothing inside the declared radius still authors
   const EXCLUDED = new Set([
     // This pin authors the key to assert its refusal and its conversion.
     THIS_FILE,
-    // The props-lint pin authors the key to assert the advisory warning an
+    // The props-lint pin authors the key to assert the refusal (an `error`) an
     // author meets at `os validate` / `os build` / `os lint`.
     'packages/lint/src/validate-component-props.test.ts',
   ]);
diff --git a/packages/spec/src/ui/page-header-breadcrumb-retirement.test.ts b/packages/spec/src/ui/page-header-breadcrumb-retirement.test.ts
index 37fe2b3f473..dfcfac4f610 100644
--- a/packages/spec/src/ui/page-header-breadcrumb-retirement.test.ts
+++ b/packages/spec/src/ui/page-header-breadcrumb-retirement.test.ts
@@ -16,8 +16,9 @@
  *   1. A `retiredKey()` tombstone on `PageHeaderProps`, a `strictObject` — the
  *      refusal carries the prescription, and the key's input type is `never`.
  *      `PageComponentSchema.properties` is an open bag, so the props schema is
- *      reached by the advisory props lint and never by the page parse: an
- *      existing page is never hard-refused.
+ *      reached by the props lint — which refuses this tombstone as an `error`
+ *      at `os validate` / `os build` / `os lint` — and never by the page parse:
+ *      an existing page is never hard-refused at load.
  *   2. D2 conversion `page-header-breadcrumb-removed` (step 18), a strip of
  *      both values from every `page:header`, retired from the load path: a
  *      stored or built page replays clean, with a notice.
@@ -352,7 +353,7 @@ describe('tree-scoped absence: nothing inside the declared radius still authors
   const EXCLUDED = new Set([
     // This pin authors the key to assert its refusal and its conversion.
     THIS_FILE,
-    // The props-lint pin authors the key to assert the advisory warning an
+    // The props-lint pin authors the key to assert the refusal (an `error`) an
     // author meets at `os validate` / `os build` / `os lint`.
     'packages/lint/src/validate-component-props.test.ts',
   ]);