feat(M13): auto-PR via gh CLI after successful push (auto_pr=true)

New src/git/pr.ts helper wraps 'gh pr create'; returns { url } or { error }.
maybeCreateAutoPr() in update-job-status checks product.auto_pr, builds title
from story.code + task.title, writes pr_url to DB. Non-fatal: gh failure logs
a warning and leaves DONE status intact. Also syncs schema: auto_pr on Product,
pr_url on ClaudeJob.

__tests__/git/pr.test.ts

@@ -0,0 +1,69 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+const { mockExecFile } = vi.hoisted(() => ({ mockExecFile: vi.fn() }))
+
+vi.mock('node:child_process', () => ({ execFile: mockExecFile }))
+vi.mock('node:util', () => ({
+  promisify:
+    (fn: (...args: unknown[]) => void) =>
+    (...args: unknown[]) =>
+      new Promise((resolve, reject) =>
+        fn(...args, (err: Error | null, result: unknown) => (err ? reject(err) : resolve(result))),
+      ),
+}))
+
+import { createPullRequest } from '../../src/git/pr.js'
+
+beforeEach(() => {
+  vi.clearAllMocks()
+})
+
+describe('createPullRequest', () => {
+  it('returns PR URL when gh succeeds', async () => {
+    mockExecFile.mockImplementation(
+      (_cmd: string, _args: string[], _opts: unknown, cb: (err: null, res: { stdout: string; stderr: string }) => void) =>
+        cb(null, { stdout: 'Creating pull request...\nhttps://github.com/org/repo/pull/42\n', stderr: '' }),
+    )
+
+    const result = await createPullRequest({
+      worktreePath: '/worktrees/job-abc',
+      branchName: 'feat/job-abc',
+      title: 'SCRUM-1: Add feature',
+      body: 'Summary\n\n---\n\n*Auto-generated*',
+    })
+
+    expect(result).toEqual({ url: 'https://github.com/org/repo/pull/42' })
+  })
+
+  it('returns error when gh is not installed (ENOENT)', async () => {
+    mockExecFile.mockImplementation(
+      (_cmd: string, _args: string[], _opts: unknown, cb: (err: Error) => void) =>
+        cb(Object.assign(new Error('spawn gh ENOENT'), { code: 'ENOENT' })),
+    )
+
+    const result = await createPullRequest({
+      worktreePath: '/worktrees/job-abc',
+      branchName: 'feat/job-abc',
+      title: 'My PR',
+      body: 'Body',
+    })
+
+    expect(result).toMatchObject({ error: expect.stringContaining('gh CLI not found') })
+  })
+
+  it('returns error on generic gh failure', async () => {
+    mockExecFile.mockImplementation(
+      (_cmd: string, _args: string[], _opts: unknown, cb: (err: Error) => void) =>
+        cb(new Error('authentication required')),
+    )
+
+    const result = await createPullRequest({
+      worktreePath: '/worktrees/job-abc',
+      branchName: 'feat/job-abc',
+      title: 'My PR',
+      body: 'Body',
+    })
+
+    expect(result).toMatchObject({ error: expect.stringContaining('gh pr create failed') })
+  })
+})

__tests__/update-job-status-auto-pr.test.ts

@@ -0,0 +1,85 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+vi.mock('../src/prisma.js', () => ({
+  prisma: {
+    product: { findUnique: vi.fn() },
+    task: { findUnique: vi.fn() },
+  },
+}))
+
+vi.mock('../src/git/pr.js', () => ({
+  createPullRequest: vi.fn(),
+}))
+
+import { prisma } from '../src/prisma.js'
+import { createPullRequest } from '../src/git/pr.js'
+import { maybeCreateAutoPr } from '../src/tools/update-job-status.js'
+
+const mockPrisma = prisma as unknown as {
+  product: { findUnique: ReturnType<typeof vi.fn> }
+  task: { findUnique: ReturnType<typeof vi.fn> }
+}
+const mockCreatePr = createPullRequest as ReturnType<typeof vi.fn>
+
+const BASE_OPTS = {
+  jobId: 'job-abc',
+  productId: 'prod-1',
+  taskId: 'task-1',
+  worktreePath: '/wt/job-abc',
+  branchName: 'feat/job-abc',
+  summary: 'Implemented the feature',
+}
+
+beforeEach(() => {
+  vi.clearAllMocks()
+  mockPrisma.product.findUnique.mockResolvedValue({ auto_pr: true })
+  mockPrisma.task.findUnique.mockResolvedValue({
+    title: 'Add feature',
+    story: { code: 'SCRUM-42' },
+  })
+  mockCreatePr.mockResolvedValue({ url: 'https://github.com/org/repo/pull/99' })
+})
+
+describe('maybeCreateAutoPr', () => {
+  it('returns PR URL when auto_pr=true and gh succeeds', async () => {
+    const url = await maybeCreateAutoPr(BASE_OPTS)
+    expect(url).toBe('https://github.com/org/repo/pull/99')
+    expect(mockCreatePr).toHaveBeenCalledWith({
+      worktreePath: BASE_OPTS.worktreePath,
+      branchName: BASE_OPTS.branchName,
+      title: 'SCRUM-42: Add feature',
+      body: expect.stringContaining(BASE_OPTS.summary),
+    })
+  })
+
+  it('returns null when auto_pr=false', async () => {
+    mockPrisma.product.findUnique.mockResolvedValue({ auto_pr: false })
+    const url = await maybeCreateAutoPr(BASE_OPTS)
+    expect(url).toBeNull()
+    expect(mockCreatePr).not.toHaveBeenCalled()
+  })
+
+  it('uses task title without code prefix when story has no code', async () => {
+    mockPrisma.task.findUnique.mockResolvedValue({
+      title: 'Add feature',
+      story: { code: null },
+    })
+    await maybeCreateAutoPr(BASE_OPTS)
+    expect(mockCreatePr).toHaveBeenCalledWith(
+      expect.objectContaining({ title: 'Add feature' }),
+    )
+  })
+
+  it('returns null and does not throw when gh fails', async () => {
+    mockCreatePr.mockResolvedValue({ error: 'gh CLI not found' })
+    const url = await maybeCreateAutoPr(BASE_OPTS)
+    expect(url).toBeNull()
+  })
+
+  it('returns null when product not found', async () => {
+    mockPrisma.product.findUnique.mockResolvedValue(null)
+    const url = await maybeCreateAutoPr(BASE_OPTS)
+    expect(url).toBeNull()
+    expect(mockCreatePr).not.toHaveBeenCalled()
+  })
+})