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Pull the control plane's host-side logic out of `infra_vm` into `FirecrackerOrchestrator` (backend/firecracker/orchestrator.py): booting the orchestrator microVM on its link with the persistent registry volume (/dev/vdb), seeding the host-canonical signing key over SSH, waiting for /health, and the buildah SSH target. `url()` == `gateway_url()` (the gateway resolves the orchestrator by guest IP via bb_orch). This completes the trio — docker, macOS, firecracker — behind both the Gateway and Orchestrator ABCs. `infra_vm` stays the pair coordinator + shared substrate: `ensure_running` now mints nothing itself — it constructs both services (lazy import to break the cycle), calls `orchestrator.ensure_running()` first, then `gateway.connect_to_orchestrator(orch.gateway_url(), orch.mint_gateway_token())`. The plane-agnostic boot primitives graduate to public API (`_boot_vm`/ `_push_secret` -> `boot_vm`/`push_secret`) now that they're consumed only across modules; `InfraVm` loses its `orchestrator_url` (moved to the service) and `InfraEndpoint.orchestrator` is now the `FirecrackerOrchestrator` service. Container-lifecycle tests split into test_firecracker_orchestrator; the infra_vm tests keep the substrate + pair-coordinator coverage. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>