Decorator: register a migrator that upgrades ``artifact`` from ``from_version`` to the next.

Replay every ``*.json`` history in ``history_dir``; raise on the first replay failure. Returns the number of histories successfully replayed.

Fan out sub-agent child workflows concurrently and gather their briefs (failures dropped).

Activity wrapper around one idempotent agent cycle.

Run a mission locally (no Temporal) until complete / blocked / over-budget.

Run mutation testing in ``workdir`` and parse killed/survived counts.

Construct + run one sub-agent and return its condensed brief.

Persist the session's state and return a restorable handle.

Start (or attach to) a mission workflow keyed by mission id and await its result. The workflow id IS the mission id, so re-invoking is idempotent

Current status — lets a human distinguish SLEEPING from WAITING_ON_HUMAN.

Return the mission anchor recited into the agent's context every cycle. This is the anti-drift mechanism: a compact, authoritative restatemen