refactor(orchestrator): move run_docker to a lean top-level docker_cmd (#352)

Review feedback: don't bury a parallel docker util in the orchestrator.
But reusing backend.docker.util (docker_mod) isn't right either — importing
it runs backend/__init__.py, which eagerly loads all three backends
(docker + firecracker + macos) plus the manifest/egress/git-gate/supervise
framework (~76 modules), so every orchestrator import would drag the whole
backend layer in.

Compromise: promote the helper to a top-level, framework-free
bot_bottle/docker_cmd.py (single stdlib import), a proper shared home the
orchestrator's docker components use now and backend.docker.util can adopt
later. Verified `import bot_bottle.orchestrator` stays lean (12 modules, no
firecracker/macos backends).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck

bot_bottle/orchestrator/docker_broker.py

@@ -15,8 +15,8 @@ from __future__ import annotations
 
 import subprocess
 
+from ..docker_cmd import run_docker
 from .broker import LaunchBroker, LaunchRequest
-from .dockerutil import run_docker
 
 CONTAINER_PREFIX = "bot-bottle-orch-"
 BOTTLE_ID_LABEL = "bot-bottle-bottle-id"

bot_bottle/orchestrator/dockerutil.py

@@ -1,19 +0,0 @@
-"""Shared `docker` subprocess helper for the orchestrator's docker-backed
-components (the launch broker and the consolidated sidecar)."""
-
-from __future__ import annotations
-
-import subprocess
-
-
-def run_docker(argv: list[str]) -> subprocess.CompletedProcess[str]:
-    """Run a `docker` command, capturing stdout/stderr as text. Never raises
-    on a non-zero exit — callers inspect `returncode` / `stderr` so they can
-    stay fail-closed or tolerate idempotent no-ops (e.g. removing an
-    already-absent container)."""
-    return subprocess.run(
-        argv, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, check=False,
-    )
-
-
-__all__ = ["run_docker"]

bot_bottle/orchestrator/sidecar.py

@@ -19,7 +19,7 @@ from __future__ import annotations
 
 import abc
 
-from .dockerutil import run_docker
+from ..docker_cmd import run_docker
 
 SIDECAR_NAME = "bot-bottle-orch-sidecar"
 SIDECAR_LABEL = "bot-bottle-orch-sidecar=1"