PBI-49: review-fixes — primary_worktree order, idea-claim rollback, sprint mark-ready fallback

Three findings from PBI-47 review:

P1 — primary_worktree_path scheiden van lock-volgorde
  setupProductWorktrees acquired locks in alphabetical order (deadlock prevention)
  but also returned worktrees in that order, so worktrees[0] could point at a
  secondary product when its id sorted before the primary's. Lock-acquire stays
  sorted; output now preserves caller's input order so worktrees[0] is always
  the primary.

P1 — Idea-claim rollback bij worktree setup failure
  setupProductWorktrees runs after tryClaimJob has already flipped the job to
  CLAIMED. A failure in lock-acquire/git-fetch/reset/sync left the job hanging
  until the 30-min stale-reset and the lock-map populated. Wrapped in try/catch
  with releaseLocksOnTerminal + rollbackClaim mirror of the task-pad behaviour.

P2 — SPRINT mark-ready fallback when last task didn't push
  The mark-ready path used updated.pr_url, which is null when the closing task
  was verify-only or had no diff. Now falls back to a Prisma findFirst on the
  SprintRun's earliest job with pr_url IS NOT NULL.

Tests: 31 files, 243 passing (incl. new input-order regression for setupProductWorktrees).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

__tests__/git/job-locks.test.ts

@@ -118,4 +118,19 @@ describe('job-locks: setupProductWorktrees', () => {
     // Lock was still acquired and registered — release cleans up
     await releaseLocksOnTerminal('j3')
   })
+
+  it('output preserves input order regardless of alphabetical lock-acquire order', async () => {
+    // 'z-primary' sorts AFTER 'a-secondary' alphabetically, but caller passes
+    // primary first → output[0] must be 'z-primary' so wait_for_job's
+    // primary_worktree_path = worktrees[0]?.worktreePath points at the right repo.
+    const result = await setupProductWorktrees(
+      'j4',
+      ['z-primary', 'a-secondary'],
+      async () => originRepo,
+    )
+    expect(result).toHaveLength(2)
+    expect(result[0].productId).toBe('z-primary')
+    expect(result[1].productId).toBe('a-secondary')
+    await releaseLocksOnTerminal('j4')
+  })
 })