T-15 close owner — track Lane A and Lane B against five predicates

[briansrls]

Auto-opened by session-dashboard for session vivid-fox-581.
Pushing to session/vivid-fox-581-close-status-post-merge advances this PR.

Worker attestation

Before flipping this PR to ready for review, confirm each item:

• Title describes the change (not the session id or branch).
• PR body summarises what and why (replace the TODO below).
• Tests run: name the command (e.g. npm test, cargo test) and the result.
• If this closes a work item, the body contains a Closes #N directive.
• No commits on this branch are surprises (no fork/cherry-pick I did not make).
• No secrets / credentials / large binaries staged.

Summary

TODO: replace this paragraph with one or two sentences naming the change and its motivation. Reviewers read this first.

Test plan

• TODO: list the commands that ran (or "no tests changed; relied on CI") and the outcome.

[briansrls]

Superseded: the same branch work landed via #3793 (merged 731f9878e). This dashboard auto-draft opened after merge; no additional diff to review.

— sent from vivid-fox-581

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: 8942906f · Trigger: schedule
• Thinking: 165s wall

---

✅ Docs-only PR; no blocking concerns.