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Chunk 1 of the host-control-server stack: close the PRD's **transport** gap. Today LaunchBroker.submit(token) is an in-process method call from OrchestratorCore; this makes it a real out-of-process service reached over HTTP. - host_server.py: the host control server. A pure dispatch() (POST /broker verifies a signed token via the existing verify_request + _launch/_teardown path, GET /health) wrapped by a thin http.server adapter, mirroring orchestrator/server.py. Only the signed token crosses the wire; provenance/schema failures are fail-closed 401s that never touch the backend, a backend launch failure is a 502. - broker_client.py: BrokerClient — a drop-in submit(token) that POSTs the signed token to the host controller. A 401 re-raises as BrokerAuthError so the launch path's rollback is identical local or remote. - broker.py: SubmitBroker Protocol — the one method OrchestratorCore depends on, satisfied by both LaunchBroker and BrokerClient, so the core is unchanged (service.py annotation only). - __main__.py: wire `--broker http` behind the shared-secret env var (BOT_BOTTLE_BROKER_SECRET, hex) — a chunk-1 stopgap the durable TrustDomain key (chunk 2, #476) replaces. Tested: pure-dispatch cases, BrokerClient with HTTP mocked, and a real-socket sign -> POST -> verify -> act round-trip (incl. fail-closed forged token). pyright clean; pylint 9.86. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>