Fix batch child jobs created as 'processing' instead of 'pending'

[chubes4]

Summary

Fixes #858 — batch fan-out child jobs were immediately set to processing at creation time, before Action Scheduler picked them up. After 2 hours, recover-stuck would mark them as timed out even though they were just waiting in the AS queue.

Root cause

PipelineBatchScheduler::createChildJob()
  1. create_job()     → status = 'pending'  ✓
  2. start_job()      → status = 'processing'  ← BUG: premature
  3. schedule_next_step()  → AS queues it for later
  
  // 2 hours pass, AS hasn't gotten to it yet...
  recover-stuck sees: status='processing', age > 2h → marks FAILED

Same pattern in TaskScheduler::scheduleTask().

Fix

Move the pending → processing transition to the actual moment of execution:

Location	Before	After
PipelineBatchScheduler::createChildJob()	start_job() after create_job()	Removed — child stays pending
ExecuteStepAbility::execute()	No status change	Added start_job() at entry — transitions to processing when AS fires
TaskScheduler::scheduleTask()	start_job() after create_job()	Removed — task stays pending
TaskScheduler::handleTask()	No status change	Added start_job() at entry — transitions to processing when AS fires

For parent jobs, the start_job() in ExecuteStepAbility is a no-op (already processing via RunFlowAbility). For child jobs, it's the real transition.

Result

• recover-stuck only catches genuinely stuck jobs (started processing but never finished)
• Jobs waiting in the AS queue stay pending and won't be incorrectly timed out
• No changes to the recover-stuck logic itself — it correctly targets processing status

Testing

• 873/873 tests pass (29 pre-existing failures on main, unchanged)
• Lint passes with no new findings

[github-actions]

Homeboy Results — data-machine

Lint

⚡ Scope: changed files only

✅ lint (changed files only)

Test

⚡ Scope: changed files only

✅ test (changed files only)

Audit

⚡ Scope: changed files only

✅ audit (changed files only)

Tooling versions

• Homeboy CLI: homeboy 0.81.1+385399ee
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: unknown
• Action: Extra-Chill/homeboy-action@v1

---

Homeboy Action v1