chore: temporary diagnostic for active-conversation cap (do not merge) - #90

On November 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target

Copilot review request not confirmed after 3 minutes on themegrill/.github#90. This is a known intermittent GitHub platform issue, not a config problem -- it may still complete later.