Replace the Janet synchronous agent shim (agent = atom, send applies inline) with
JVM-style async agents: send/send-off enqueue an action and a single worker thread
per agent applies them in order; deref reads the current (maybe not-yet-updated)
state without blocking; await blocks until the queue drains. A validator rejection
or a thrown action puts the agent in an error state (agent-error) and halts the
queue; restart-agent clears it. send and send-off share one serialized worker (a
superset of the JVM's fixed/cached pool split). Native versions re-asserted in
post-prelude over the overlay; await/restart-agent are new.
Corpus: the two "send/send-off applies" cases do (send a f) (deref a) with no
await, so they now read state before the action runs — diverging like the JVM
(the suite was literally "synchronous shim"). Allowlisted on both gates; floors
-2 (zero-Janet 2569->2567, prelude 2559->2557). cli-test covers async agents via
await (ordered 100-send dispatch, error capture) — 49/49. Janet gate + JVM cert
green; 0 new divergences on either corpus.
jolt-byjr
c719e54543