feat(sidecar): API reusable de discovery via broker
Promueve el patron ad-hoc discover_producer_socket que vivia inline en
'nouser attract --remote' a un modulo publico brahman_sidecar::discovery.
Cualquier consumer ahora puede preguntar al broker "quien provee este
TypeRef?" sin reimplementar el patron a mano.
API:
- build_consumer_card(label, flow_name, type_name) construye una Card
minima (Ente, Oneshot, Virtual) con un input flow. Asigna Ulid::new()
real (no nil), evitando colisiones en el broker.
- await_provider(card, timeout) async: conecta al init, espera
MatchEvent::Available, devuelve producer_service_socket, manda
Farewell. Ignora eventos Lost durante el await.
- await_provider_blocking(card, timeout) wrapper para mundos no-async
(CLIs, std-thread loops). Crea su propio runtime current_thread.
- ConsumerError tipado: Connect{socket,source}, NoProvider{flow,type_ref,
timeout}, Client(ClientError), Runtime(String). Adios al Box<dyn Error>.
Refactor en nouser daemon: discover_producer_socket inline (60 LOC) ->
5 LOC delegando en el helper. remote_embed ya no construye su propio
runtime.
Tests: 4 unitarios (id no-nil, id unico por llamada, formateo de Wit
TypeRef, fallback sin input). Build verde para sidecar y nouser-core.
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@@ -1217,6 +1217,7 @@ dependencies = [
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"brahman-card",
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"brahman-card-wit",
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"brahman-handshake",
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"thiserror 2.0.18",
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"tokio",
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"tracing",
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"tracing-subscriber",
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