glm-5.2 67b1adba98 feat(call/client/from-call-streaming-forwarding): branch from_call forwarding on op_type ...

Subscription ops discovered via services/list + services/schema now
register a StreamingHandler (HandlerKind::Stream) that calls
CallConnection::subscribe_with_payload and forwards the remote stream
end-to-end (ADR-049 §8). Query/Mutation ops keep the existing
make_forwarding_handler (HandlerKind::Once).

- Add CallConnection::subscribe_with_payload(payload) mirroring
  call_with_payload so the forwarding handler can populate forwarded_for
  (ADR-032) + auth_token on the subscription payload. subscribe() now
  delegates to subscribe_with_payload.
- Add make_streaming_forwarding_handler() in from_call.rs using
  make_streaming_handler + futures::stream::once(...).flatten() to await
  subscribe_with_payload then forward its stream.
- Branch build_bundles on spec.op_type (already parsed by rebuild_spec_for).
- Reuse build_forwarded_payload — no new payload-construction code.
- composition_authority: None, scoped_env: None for FromCall streaming
  leaves (same as Query/Mutation FromCall leaves).
- Abort cascade (ADR-016 §6) already wired via PendingRequestMap in
  subscribe_with_payload.

Closes the gap where a from_call-imported Subscription truncated to the
first value.

2026-07-02 09:43:45 +00:00

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