Harvest sessions (one tick)

One pass over every session newer than the watermark, then stop. acron owns recurrence; never schedule yourself.

This is the unattended backstop for the capture rule in the global AGENTS.md: that rule fires in the moment and depends on an agent noticing, so it misses whatever nobody noticed. This pass reads the transcripts those sessions left behind and files what they should have filed.

State lives in a watermark file, so a tick is idempotent: a quiet day costs one scan and exits.

Rails