@@ -0,0 +1,17 @@
+---
+'@object-ui/plugin-detail': patch
+---
+
+feat(plugin-detail): the default record page lets an editor move a record to another stage by pressing it on the stage path
+
+Clause-②: no
+Metadata-protocol: none
+
+**Visible behaviour change on a released page.** The record page the console synthesizes for an object with a stage field (no authored page) used to draw its stage path as a read-only progress rail, so moving a deal to its next stage took 编辑 → change the stage → 更新. That page's `record:path` now carries `allowStageChange: true`, the existing opt-in (no new metadata key):
+
+- **Who can press.** Unchanged from the opt-in: a reader the record page lets edit this record, on a stage field that is not read-only or computed, whose field edit grant holds for the stored row. Everyone else keeps the read-only path, and so does an editor while the record's inline edit holds unsaved changes.
+- **Every press asks for confirmation**, then saves the stage through the record's ordinary update with the record's version, so the object's validation rules and `state_machine` decide. A refused move is shown under the path, naming any other field the move needs (for example a field made required by the new stage); nothing is written.
+- **Only reachable stages are offered.** On every page with the opt-in, a stage the stage field's blocking `state_machine` cannot reach from the stored value is drawn as a readout, not a button, the same moves the record form, the grid's inline editor and the board offer. A field with no such rule offers every stage, and the server still judges each move.
+- **Authored pages keep their own setting.** A page, or an authored `highlights` slot, that declares its own `record:path` keeps whatever it declares: `true`, `false`, or the key left out (a read-only rail).
+
+To keep a default record page's path read-only, assign the object an authored page (or a `highlights` slot) whose `record:path` leaves `allowStageChange` out or sets it `false`.
@@ -26,6 +26,15 @@
  * markup stops claiming to be a control; a real click-to-advance stage control
  * is a separate card with its own appetite, NOT folded in here.
  *
+ * That separate card landed as the `allowStageChange` opt-in
+ * (objectstack#28061), and a later ruling (objectstack#30075, option A) has
+ * the synthesized DEFAULT record page write the opt-in on its path, so for an
+ * editor that page's path is a real control (pinned in
+ * `record-path.stageChange-28199.test.tsx`). What this file pins is unchanged
+ * and still binds: a `record:path` node that does not carry the opt-in — an
+ * authored page that leaves the key out or sets it `false` — is the readout
+ * below, and must not look like a control. Every mount here is such a node.
+ *
  * ── What each group is for ────────────────────────────────────────────────
  *
  * Group A is the CONTROL — what must not move. It also establishes
 
@@ -11,6 +11,13 @@
  * a server refusal is shown in place; a reader who may not edit the status
  * field — and every path that does not opt in — keeps the readout.
  *
+ * The last two groups pin objectstack#30075 (ruling: option A): the
+ * synthesized default record page's path carries the opt-in, mounted here as
+ * the JSON document `buildDefaultPageSchema` emits, through the real
+ * `SchemaRenderer`; an authored `highlights` slot keeps its declared value;
+ * and a stage the field's blocking `state_machine` cannot reach from the
+ * stored value is never offered as a press.
+ *
  * The subject is imported relatively and `@object-ui/*` resolves to source
  * through the root vitest alias table, so nothing here reads a `dist/`.
  */
@@ -19,7 +26,7 @@ import * as React from 'react';
 import { describe, it, expect, vi, afterEach, beforeEach } from 'vitest';
 import { render, cleanup, fireEvent, screen, waitFor, within } from '@testing-library/react';
 import '@testing-library/jest-dom';
-import { InlineEditProvider, RecordContextProvider, useInlineEdit } from '@object-ui/react';
+import { InlineEditProvider, RecordContextProvider, SchemaRenderer, useInlineEdit } from '@object-ui/react';
 
 const { permsStub, perms } = vi.hoisted(() => {
   const perms: { isLoaded: boolean; writeDenied: string[] } = { isLoaded: true, writeDenied: [] };
@@ -49,6 +56,9 @@ vi.mock('@object-ui/permissions', async (importOriginal) => {
 });
 
 import { RecordPathRenderer } from '../record-path';
+import { buildDefaultPageSchema } from '../../synth/buildDefaultPageSchema';
+// Registers `record:path` for the `SchemaRenderer` mounts below.
+import '../../index';
 
 const STAGES = [
   { value: 'draft', label: 'Draft' },
@@ -272,3 +282,151 @@ describe('record:path allowStageChange — who sees the readout', () => {
     await waitFor(() => noButtons(container));
   });
 });
+
+/** The object as a host binds it: a stage picklist the default page derives its path from. */
+const QUOTE_DEF = {
+  name: 'crm_quote',
+  fields: {
+    name: { type: 'text', label: 'Name' },
+    status: {
+      type: 'select',
+      label: 'Status',
+      options: STAGES.map(({ value, label }) => ({ value, label })),
+    },
+    amount: { type: 'currency', label: 'Amount' },
+  },
+  stageField: 'status',
+};
+
+/** A blocking machine: from draft only in_review (or declined); never straight to accepted. */
+const MACHINE = {
+  type: 'state_machine',
+  name: 'quote_flow',
+  field: 'status',
+  message: 'A quote cannot skip review.',
+  transitions: { draft: ['in_review', 'declined'], in_review: ['accepted', 'declined'] },
+};
+
+/** Every `record:path` node among a synthesized page's top-level components. */
+const pathNodesOf = (page: any): any[] =>
+  page.regions[0].components.filter((c: any) => c?.type === 'record:path');
+
+function mountNode(node: unknown, opts: Omit<MountOptions, 'allowStageChange'> = {}) {
+  const dataSource = opts.dataSource ?? makeDataSource();
+  const refresh = opts.refresh ?? vi.fn(async () => {});
+  const r = render(
+    <RecordContextProvider
+      objectName="crm_quote"
+      recordId="q1"
+      data={{ id: 'q1', status: 'draft', updated_at: VERSION }}
+      objectSchema={opts.objectSchema ?? QUOTE_DEF}
+      dataSource={dataSource as any}
+      refresh={refresh}
+    >
+      <InlineEditProvider canEdit={opts.canEdit ?? true}>
+        <SchemaRenderer schema={node as never} />
+      </InlineEditProvider>
+    </RecordContextProvider>,
+  );
+  return { ...r, dataSource, refresh };
+}
+
+const buttonNames = (row: HTMLElement): (string | null)[] =>
+  within(row).queryAllByRole('button').map((b) => b.getAttribute('aria-label'));
+
+describe('#30075 the default record page turns click-to-advance on', () => {
+  it('the synthesized page writes allowStageChange: true on its path node', () => {
+    const [path] = pathNodesOf(buildDefaultPageSchema(QUOTE_DEF as never));
+    expect(path.properties).toMatchObject({ statusField: 'status', allowStageChange: true });
+  });
+
+  it('a reader who may edit the stage field gets a press, with a confirmation, through the record update', async () => {
+    const [path] = pathNodesOf(buildDefaultPageSchema(QUOTE_DEF as never));
+    const { container, dataSource, refresh } = mountNode(path);
+    expect(rows(container)).toHaveLength(2);
+    for (const row of rows(container)) {
+      expect(buttonNames(row)).toEqual(['Move to In review', 'Move to Accepted', 'Move to Declined']);
+    }
+    fireEvent.click(within(rows(container)[0]).getByRole('button', { name: 'Move to In review' }));
+    // Nothing is written before the reader confirms.
+    const dialog = await screen.findByRole('alertdialog');
+    expect(dataSource.update).not.toHaveBeenCalled();
+    fireEvent.click(within(dialog).getByRole('button', { name: 'Move' }));
+    await waitFor(() => expect(dataSource.update).toHaveBeenCalledTimes(1));
+    expect(dataSource.update).toHaveBeenCalledWith('crm_quote', 'q1', { status: 'in_review' }, { ifMatch: VERSION });
+    await waitFor(() => expect(refresh).toHaveBeenCalledTimes(1));
+  });
+
+  it('a reader the page may not let edit this record keeps the read-only path', () => {
+    const [path] = pathNodesOf(buildDefaultPageSchema(QUOTE_DEF as never));
+    const { container } = mountNode(path, { canEdit: false });
+    expect(rows(container)).toHaveLength(2);
+    for (const row of rows(container)) expect(row.querySelectorAll('button,[tabindex]')).toHaveLength(0);
+  });
+
+  it('a reader without the edit grant on the stage field keeps the read-only path', () => {
+    perms.writeDenied = ['status'];
+    const [path] = pathNodesOf(buildDefaultPageSchema(QUOTE_DEF as never));
+    const { container } = mountNode(path);
+    expect(rows(container)).toHaveLength(2);
+    for (const row of rows(container)) expect(row.querySelectorAll('button,[tabindex]')).toHaveLength(0);
+  });
+
+  it.each([true, false])('an authored highlights slot keeps its declared allowStageChange: %s', (declared) => {
+    const authored = { type: 'record:path', properties: { statusField: 'status', stages: STAGES, allowStageChange: declared } };
+    const page = buildDefaultPageSchema(QUOTE_DEF as never, { slots: { highlights: [authored] } } as never);
+    const [path] = pathNodesOf(page);
+    expect(path.properties.allowStageChange).toBe(declared);
+    const { container } = mountNode(path);
+    const names = buttonNames(rows(container)[0]);
+    expect(names.length > 0).toBe(declared);
+  });
+
+  it('an authored highlights slot that leaves the key out keeps the readout', () => {
+    const authored = { type: 'record:path', properties: { statusField: 'status', stages: STAGES } };
+    const page = buildDefaultPageSchema(QUOTE_DEF as never, { slots: { highlights: [authored] } } as never);
+    const [path] = pathNodesOf(page);
+    expect('allowStageChange' in path.properties).toBe(false);
+    for (const row of rows(mountNode(path).container)) expect(buttonNames(row)).toEqual([]);
+  });
+});
+
+describe('#30075 the press offers only the moves the field\'s state machine admits', () => {
+  const MACHINED = { ...QUOTE_DEF, validations: [MACHINE] };
+
+  it('a stage the machine cannot reach from the stored value is a readout, not a button', () => {
+    const [path] = pathNodesOf(buildDefaultPageSchema(MACHINED as never));
+    const { container } = mountNode(path, { objectSchema: MACHINED });
+    for (const row of rows(container)) {
+      expect(buttonNames(row)).toEqual(['Move to In review', 'Move to Declined']);
+      // The unreachable stage is still drawn, as a plain listitem.
+      expect(within(row).getByText('Accepted').closest('button')).toBeNull();
+    }
+  });
+
+  it('control: a warning-severity machine does not narrow the press (the server would not refuse)', () => {
+    const warned = { ...QUOTE_DEF, validations: [{ ...MACHINE, severity: 'warning' }] };
+    const [path] = pathNodesOf(buildDefaultPageSchema(warned as never));
+    const { container } = mountNode(path, { objectSchema: warned });
+    expect(buttonNames(rows(container)[0])).toEqual(['Move to In review', 'Move to Accepted', 'Move to Declined']);
+  });
+
+  it('a move the server still refuses (here a required field elsewhere) is shown in place, nothing else changes', async () => {
+    const refusal = Object.assign(new Error('VALIDATION_FAILED'), {
+      code: 'VALIDATION_FAILED',
+      fields: [{ field: 'amount', code: 'required', message: 'is required to send a quote for review' }],
+    });
+    const [path] = pathNodesOf(buildDefaultPageSchema(MACHINED as never));
+    const { container, refresh } = mountNode(path, {
+      objectSchema: MACHINED,
+      dataSource: makeDataSource(async () => { throw refusal; }),
+    });
+    await pressAndConfirm(container, 'In review');
+    const alert = await within(container).findByRole('alert');
+    expect(alert).toHaveTextContent('Amount: is required to send a quote for review');
+    expect(refresh).not.toHaveBeenCalled();
+    for (const row of rows(container)) {
+      expect(row.querySelector('[aria-current="step"]')).toHaveAttribute('aria-label', 'Draft, current stage');
+    }
+  });
+});
@@ -26,13 +26,15 @@
  * mouseup → click) left the record's status untouched. Users spent clicks
  * on it before concluding it was decoration.
  *
- * Unless the author opts in with `allowStageChange: true`, nothing on the
- * path writes, so the pixels must not promise a press. Click-to-advance is
- * that opt-in (objectstack#28061, `./recordPathStageChange`): only then, and
- * only for a reader who may edit `statusField` on this record, does each stage
- * other than the current one carry a real `<button>` that asks to move the
- * record there. Everyone else — and every page that does not opt in — gets the
- * readout below, unchanged.
+ * Unless the node carries `allowStageChange: true`, nothing on the path
+ * writes, so the pixels must not promise a press. Click-to-advance is that
+ * opt-in (objectstack#28061, `./recordPathStageChange`): only then, and only
+ * for a reader who may edit `statusField` on this record, does each stage
+ * other than the current one — and that the field's state machine can reach —
+ * carry a real `<button>` that asks to move the record there. The synthesized
+ * default record page writes the opt-in on its path (objectstack#30075); an
+ * authored page keeps what it declared. Everyone else — and every node that
+ * does not opt in — gets the readout below, unchanged.
  *
  * So the presentation below is a PROGRESS RAIL: a thin decorative indicator
  * per stage with the label as plain text beneath it, which is the same
@@ -594,9 +596,10 @@ const RecordPathBody: React.FC<RecordPathRendererProps> = ({
     /** The label's full text as a `title`, for a row whose labels can be cut. */
     labelTitle?: string;
   }) => {
-    // A stage is a press only behind the opt-in, and never the stage the
-    // record already stands on: there is nowhere to move to.
-    const press = stageChange.pressable && o.state !== 'current';
+    // A stage is a press only behind the opt-in, never the stage the record
+    // already stands on (there is nowhere to move to), and never a stage the
+    // field's blocking state machine cannot reach from the stored value.
+    const press = stageChange.pressable && o.state !== 'current' && stageChange.admits(o.stage.value);
     const face = (
       <>
         <span aria-hidden="true" data-stage-rail="" className={railClass(o.state, o.terminal)} />
 
@@ -25,9 +25,18 @@
  * `updated_at` as the `ifMatch` concurrency token, and re-reads the record.
  *
  * Which moves are legal is the SERVER's call: the object's `state_machine`
- * rule (ADR-0020), required fields and edit rights are judged on the write, and
- * nothing here evaluates them. A refusal is shown in place, under the rail —
- * the server's own sentences first, a fixed line only when it sent none.
+ * rule (ADR-0020), required fields and edit rights are judged on the write. A
+ * refusal is shown in place, under the rail — the server's own sentences
+ * first, a fixed line only when it sent none.
+ *
+ * What the path OFFERS follows the same machine the record form, the grid's
+ * inline editor and the board read (`stateMachineNextValues`): a stage the
+ * field's blocking `state_machine` rule cannot reach from the STORED value is
+ * drawn as a readout, not a button, so the press never promises a move the
+ * server is bound to refuse. The default record page turns this block's press
+ * on (objectstack#30075), which is why an always-refused button would reach
+ * every app with a machine on its stage field. A field without such a rule
+ * offers every stage, and the server still judges each write.
  */
 
 import React from 'react';
@@ -41,7 +50,7 @@ import {
   AlertDialogHeader,
   AlertDialogTitle,
 } from '@object-ui/components';
-import { resolveFieldAffordance } from '@object-ui/core';
+import { resolveFieldAffordance, stateMachineNextValues } from '@object-ui/core';
 import { usePermissions } from '@object-ui/permissions';
 import {
   declaredUserMessage,
@@ -113,6 +122,12 @@ const canUpdate = (ds: unknown): boolean => {
 export interface StageChange {
   /** Whether this reader may press a stage of this record's path. */
   pressable: boolean;
+  /**
+   * Whether the field's blocking `state_machine` admits a move from the
+   * stored value to `value` — `true` for every value when no such rule
+   * governs the field. Only meaningful while `pressable`.
+   */
+  admits: (value: unknown) => boolean;
   /** A write is in flight. */
   busy: boolean;
   /** The last refusal's lines, until the next press. */
@@ -152,6 +167,10 @@ export function useStageChange(allowStageChange: boolean, statusField: string |
     && !NON_EDITABLE_SYSTEM_FIELDS.has(statusField)
     && resolveFieldAffordance('recordEdit', perms, objectName, statusField);
 
+  const stored = statusField ? (ctx?.data as Record<string, unknown> | undefined)?.[statusField] : undefined;
+  const reachable = statusField ? stateMachineNextValues(ctx?.objectSchema, statusField, stored) : null;
+  const admits = (value: unknown): boolean => reachable === null || reachable.has(String(value));
+
   const request = React.useCallback((stage: { value: unknown; label: string }) => {
     setRefusal(null);
     setTarget(stage);
@@ -166,7 +185,7 @@ export function useStageChange(allowStageChange: boolean, statusField: string |
   const confirm = async () => {
     const stage = target;
     setTarget(null);
-    if (!stage || !pressable) return;
+    if (!stage || !pressable || !admits(stage.value)) return;
     setBusy(true);
     const updatedAt = (ctx?.data as Record<string, unknown> | undefined)?.updated_at;
     const ifMatch = typeof updatedAt === 'string' ? updatedAt : undefined;
@@ -202,5 +221,5 @@ export function useStageChange(allowStageChange: boolean, statusField: string |
     </AlertDialog>
   );
 
-  return { pressable, busy, refusal, request, dialog };
+  return { pressable, admits, busy, refusal, request, dialog };
 }
@@ -535,6 +535,18 @@ export function buildDefaultActions(
  *
  * Returns an array because the strip is conceptually one region with
  * two adjacent nodes.
+ *
+ * The default page's path turns click-to-advance on (`allowStageChange:
+ * true`, maintainer ruling recorded on objectstack#30075, option A): moving a
+ * record to its next stage is the record page's most frequent edit, and most
+ * apps never author a page to opt in on. Nothing about WHO may press moves
+ * here — `record:path`'s `useStageChange` still asks the page's edit session,
+ * the field's read-only/computed markers and the caller's field edit grant,
+ * offers only the moves the field's blocking `state_machine` admits, confirms
+ * every press, and saves through the ordinary record update, so the server's
+ * validation decides. A reader who may not edit the field keeps the readout.
+ * An authored page — or an authored `highlights` slot — writes its own
+ * `record:path` node and keeps whatever it declared; no new key is involved.
  */
 export function buildDefaultHighlights(
   def: ObjectDefLike | undefined,
@@ -550,7 +562,7 @@ export function buildDefaultHighlights(
     out.push(componentNode('record:highlights', { fields: highlightFields }));
   }
   if (statusField && stages && stages.length > 0) {
-    out.push(componentNode('record:path', { statusField, stages }));
+    out.push(componentNode('record:path', { statusField, stages, allowStageChange: true }));
   }
   return out;
 }