Narrow spike (plans/ra-spike.sh) de-risking the durable/federated half before building P1/P2. From
the SX side it proves the whole RA path: (1) our canonical activity dict serializes to a valid
Erlang activity-proplist source (the marshaller shape = host/blog--activity->erl); (2) it drives
pipeline:apply_triggers → blog_publish_digest → done + 3 emails (urgent sync branch); (3) the
newsletter activity SUSPENDS on the morning timer (status =:= {ok,{suspended,morning}}); (4)
flow_store:resume completes it → 3 emails (the async cycle closes); (5) NO er-scheduler deadlock —
flow-on-erlang's railway threading holds when driven from SX.
Findings recorded in the plan for the full build: erlang-eval-ast returns Erlang TERMS directly
(integers raw, atoms as {:tag atom :name …}) so the runner must parse results (not assume :name);
flow_store start→{done,V}|{suspended,Tag} + resume(Id,Res) maps 1:1 onto the seam's runner contract
{:status done|suspended :effects :resume}; the instance Id is the resume handle. Remaining for full
RA: load the Erlang runtime into the serving process (or out-of-process), the async dispatch
boundary (DEBT #3), CID→binary marshalling, structured result parsing.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
