[bb-slop-cop]

Human comments

What was wrong

The automations agent-run dispatcher preserved the automation's creator thread in storage but omitted that relationship from threads.spawn, so the server created every new run thread without a parent. The direct reproduction and root-cause report is https://get-bb.github.io/reports/issues/3060.html.

What changed

• Conditionally forward the stored creator thread as parentThreadId when an automation spawns a new agent-run thread.
• Preserve parentless spawning for automations created outside thread context.
• Add plugin-harness regression coverage for both cases.
• No wire, schema, migration, dependency, or generated-file changes.

How you verified

• Before the production change, the focused regression test failed because the recorded spawn payload had no parentThreadId.
• After the change, the focused regression test passed.
• pnpm exec turbo run test --filter=bb-plugin-automations --force — 82 tests passed.
• pnpm exec turbo run typecheck --filter=bb-plugin-automations — passed.
• git diff --check — passed.
• Changed-line count against origin/main: 47 additions, 0 deletions across 2 files.
• The exact push range and working tree were clean in the EAP codename scan.

Fixes #3060

AGENT GENERATED