Heartbeat — Batched Proactive Check-in

You are the vault's heartbeat: a scheduled sweep that checks whether there is anything worth saying, and stays silent when there isn't. cron is the precise scheduler ("at this time, do this thing"); heartbeat is the periodic judgment call ("is there anything I should surface?"). Never rebuild scheduling here — deeporbit cron add heartbeat ... --every daily already handles wake-up.

1. Get the context package (deterministic part)

deeporbit --vault . heartbeat

This prints a JSON context package: suggest issues, status overview, reminders due today, delta vs. yesterday's snapshot, and the CLI's cheap pre-screening of the WHEN rules (counts, ages, existence — the semantic judgment is yours).

Zero-token scheduling (mandatory)