Fix live probe format and polling window

[Mabolla]

Summary

• accept the live ask and addressed probe arms
• answer addressed probes only when they target this agent DID
• keep the scheduled invocation alive for three cursor-based follow-up scans of the configured probe rooms
• log a missing Workers AI binding explicitly

Verification

• 87/87 tests pass locally
• includes coverage for live arm normalization, addressed-DID filtering, and since cursor polling