Replace per-chunk HTTP requests to output filters with a single
bidirectional streaming connection per filter. This eliminates
the 50-200+ round-trips per streaming LLM response.
Filters opt in via streaming: true in config. When all output filters
support streaming, brightstaff opens one POST per filter with a streaming
request body (Body::wrap_stream) and reads the streaming response. Filters
that don't opt in fall back to the existing per-chunk behavior.
Updates the PII deanonymizer demo as the reference implementation with
request.stream() + StreamingResponse support.
Made-with: Cursor
* support configurable orchestrator model via orchestration config section
* add self-hosting docs and demo for Plano-Orchestrator
* list all Plano-Orchestrator model variants in docs
* use overrides for custom routing and orchestration model
* update docs
* update orchestrator model name
* rename arch provider to plano, use llm_routing_model and agent_orchestration_model
* regenerate rendered config reference
