${metadata.automation.test_files} and ${metadata.automation.spec_ids} are
absent from M39 work items (created from dashboard without these fields),
resulting in an empty, useless prompt:
"Implement the failing test. Test files: . Spec IDs: ."
Switch to ${metadata.task_description} — a sibling metadata key (not under
automation, so write-protected path does not apply) — populated by patching
items with their body text. The _TriggerItemView in dispatch_service.py
correctly exposes item.metadata so this resolves at compile time.
All 16 scaffolded M39 items patched with metadata.task_description via CP API.
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