fix(coding): remediate ML-07 plugin authority

tests/unit/agent-creation-dialog.test.tsx

@@ -0,0 +1,59 @@
+import { fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+import { AgentCreationDialog } from '@/components/coding/AgentCreationDialog';
+import type { CodingProjectAgent } from '@/types/coding-project';
+
+const agent: CodingProjectAgent = {
+  id: 'builder',
+  avatarId: 'avatar-01',
+  roleName: '实现者',
+  name: 'Builder',
+  builtIn: false,
+  enabled: true,
+  model: { accountId: 'account-a', modelId: 'model-a', thinkingLevel: 'medium' },
+  modelResolution: 'resolved',
+  skillIds: ['data-service'],
+  responsibility: {
+    mission: 'Implement changes', owns: [], boundaries: [], collaborators: [], principles: [],
+  },
+  prompt: '',
+  archivedAt: null,
+  pinned: false,
+  createdAt: '2026-08-27T00:00:00Z',
+  updatedAt: '2026-08-27T00:00:00Z',
+};
+
+describe('AgentCreationDialog plugin Skill availability', () => {
+  it('shows a retained disabled assignment as unavailable and persists it unchanged', async () => {
+    const onUpdate = vi.fn(async () => undefined);
+    render(<AgentCreationDialog
+      open
+      onOpenChange={vi.fn()}
+      agent={agent}
+      modelOptions={[{
+        key: JSON.stringify(['account-a', 'model-a']),
+        accountId: 'account-a',
+        modelId: 'model-a',
+        label: 'Account A / Model A',
+      }]}
+      skills={[{
+        id: 'data-service',
+        name: 'Data Service',
+        description: 'Project data tools',
+        available: false,
+        effective: false,
+      }]}
+      onUpdate={onUpdate}
+    />);
+
+    const checkbox = screen.getByRole('checkbox', { name: '绑定技能：Data Service' });
+    expect(checkbox).toBeChecked();
+    expect(checkbox).toBeDisabled();
+    expect(screen.getByText('插件未启用；现有分配会保留，但当前不可用。')).toBeVisible();
+
+    fireEvent.click(screen.getByRole('button', { name: '保存伙伴' }));
+    await waitFor(() => expect(onUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({ skillIds: ['data-service'] }),
+    ));
+  });
+});