Brings in "Stop answering cancelled requests" and reapplies its policy
onto the rebuilt seam instead of the code it targeted:
- The cancelled-request answer policy now lives at the correlator's
single site: a peer-cancelled request is never answered by the dispatch
layer, its late result or error is dropped, and it settles through a
transport-supplied hook. The dispatcher forwards the hook it receives in
message metadata; the streamable HTTP transport supplies its own, which
ends the request's stream with the REQUEST_CANCELLED terminal error
written through the request's ordered channel (so a resuming client's
replay terminates too).
- Hook containment happens once, in the correlator.
Max Isbey
5b1275beae