Add publishAt regression coverage for shared skill packages

.changeset/fix-publish-at-skill-package.md

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+---
+'@xpert-ai/contracts': patch
+'@xpert-ai/server-ai': patch
+---
+
+Ensure shared skill packages keep their `publishAt` metadata available for workspace-public publishing flows.

packages/contracts/src/ai/skill.model.spec.ts

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+import { ISkillPackage } from './skill.model'
+
+describe('ISkillPackage', () => {
+  it('exposes publishAt on shared skill packages', () => {
+    const publishAt = new Date('2026-04-09T12:00:00.000Z')
+    const skillPackage: ISkillPackage = {
+      visibility: 'private',
+      metadata: {
+        name: 'weather',
+        version: '1.0.0',
+        visibility: 'private'
+      },
+      instructions: {},
+      publishAt
+    }
+
+    expect(skillPackage.publishAt).toBe(publishAt)
+  })
+})

packages/server-ai/src/skill-package/skill-package.entity.spec.ts

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+import 'reflect-metadata'
+import { getMetadataArgsStorage } from 'typeorm'
+
+jest.mock('@xpert-ai/server-core', () => ({
+    TenantOrganizationBaseEntity: class TenantOrganizationBaseEntity {}
+}))
+
+jest.mock('../core/entities/internal', () => ({
+    SkillRepositoryIndex: class SkillRepositoryIndex {}
+}))
+
+jest.mock('../xpert-workspace/workspace.entity', () => ({
+    XpertWorkspace: class XpertWorkspace {}
+}))
+
+import { SkillPackage } from './skill-package.entity'
+import { WorkspaceBaseEntity } from '../core/entities/base.entity'
+
+describe('SkillPackage entity', () => {
+    it('inherits the publishAt column metadata', () => {
+        const publishAtColumn = getMetadataArgsStorage()
+            .filterColumns([SkillPackage, WorkspaceBaseEntity])
+            .find(({ propertyName }) => propertyName === 'publishAt')
+
+        expect(publishAtColumn).toMatchObject({
+            propertyName: 'publishAt',
+            options: expect.objectContaining({
+                type: 'timestamptz',
+                nullable: true
+            })
+        })
+    })
+})