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Retire "sidecar" for the consolidated per-host path (PRD 0070 naming decision): the orchestrator is the umbrella/control plane, and the egress/git/supervise data-plane unit it runs is the "gateway". - git mv sidecar.py -> gateway.py and the two integration + one unit test files; DockerSidecar->DockerGateway, Sidecar->Gateway, SidecarError->GatewayError, SIDECAR_*->GATEWAY_*, ensure_sidecar-> ensure_gateway, sidecar_status->gateway_status, container name bot-bottle-orch-sidecar->bot-bottle-orch-gateway. - Prose rename across broker/registry/egress/policy_resolver + PRD 0070. - Preserved: the image name bot-bottle-sidecars, the BOT_BOTTLE_SIDECAR_IMAGE env var, Dockerfile.sidecars, and PRD 0069's own stage-name cross-references (that doc still uses "sidecar"). No behavior change. Full unit suite green (1679 tests; the 13 test_sidecar_init /bin/sleep errors are pre-existing NixOS-local noise). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck