v0.5.614 — Persistent typing indicator (Telegram/WhatsApp)

Telegram/WhatsApp "typing…" now stays visible for the whole agent turn (was a one-shot ping that expired after ~5s). Self-refreshing every 4s, stops on turn completion / error / 15-min cap. Matches the open-source bridge behavior. npm: @agenticmail/enterprise@0.5.614.