diagnostic: probe C, trivial file on PR #4837 base (not for merge)

[lidge-jun]

Summary

Diagnostic probe. Not for merge; will be closed once it has answered its question.

Same trivial one-assertion file as #4839, at the same sorted position, but based on e2304ce0e3 — the base of PR #4837 — instead of current dev.

#4839 (trivial file on current dev) and #4840's companion probe (PR #4837's real test file on current dev) both left macos 1/2 green at 663 files. PR #4837 itself wedges that shard twice: 149 files, then 17 minutes of silence, then the 20-minute wall. The remaining difference is the base. dev has since landed #4835, which fixed Worker-teardown causes and re-enabled storage-worker-teardown-isolate — the same isolate/Worker-boundary family as this wedge.

If macos 1/2 wedges here, the defect belongs to the base and not to anything in #4837.

Verification

No local suite, typecheck, or build was run. The hosted macos 1/2 job on this head is the experiment.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

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[github-actions]

✅ Deterministic PR hygiene checks passed.

[lidge-jun]

Diagnostic probe complete. Result recorded in the forensics table on #4837; closing.