refactor(pipelock): move PIPELOCK_IMAGE and PIPELOCK_PORT to docker/pipelock.py

Both constants were already only used by Docker-specific code (the
sidecar boot, the proxy_url/host_port naming helpers, the image
contract test). Move them next to DockerPipelockProxy.

Top-level pipelock.py drops the 'os' import along with the constants;
the two test files that pulled PIPELOCK_IMAGE retarget at the new
location.

claude_bottle/backend/docker/pipelock.py

@@ -4,16 +4,23 @@ YAML-config generation from PipelockProxy."""
 
 from __future__ import annotations
 
+import os
 import subprocess
 
 from ...log import die, info, warn
-from ...pipelock import (
-    PIPELOCK_IMAGE,
-    PIPELOCK_PORT,
-    PipelockProxy,
-    PipelockProxyPlan,
+from ...pipelock import PipelockProxy, PipelockProxyPlan
+
+
+# Pipelock image, pinned by digest. The digest is the multi-arch image
+# index for ghcr.io/luckypipewrench/pipelock:2.3.0.
+PIPELOCK_IMAGE = os.environ.get(
+    "CLAUDE_BOTTLE_PIPELOCK_IMAGE",
+    "ghcr.io/luckypipewrench/pipelock@sha256:3b1a39417b98406ddc5dc2d8fcb42865ddc0c68a43d355db55f0f8cb06bc6de9",
 )
 
+# Listening port for pipelock's forward proxy.
+PIPELOCK_PORT = os.environ.get("CLAUDE_BOTTLE_PIPELOCK_PORT", "8888")
+
 
 def pipelock_container_name(slug: str) -> str:
     return f"claude-bottle-pipelock-{slug}"

claude_bottle/pipelock.py

@@ -12,7 +12,6 @@ Image pin: ghcr.io/luckypipewrench/pipelock@sha256:<digest> for tag 2.3.0.
 
 from __future__ import annotations
 
-import os
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
 from pathlib import Path
@@ -20,16 +19,6 @@ from pathlib import Path
 from .manifest import Bottle, Manifest
 from .util import is_ipv4_literal
 
-# Pipelock image, pinned by digest. The digest is the multi-arch image
-# index for ghcr.io/luckypipewrench/pipelock:2.3.0.
-PIPELOCK_IMAGE = os.environ.get(
-    "CLAUDE_BOTTLE_PIPELOCK_IMAGE",
-    "ghcr.io/luckypipewrench/pipelock@sha256:3b1a39417b98406ddc5dc2d8fcb42865ddc0c68a43d355db55f0f8cb06bc6de9",
-)
-
-# Listening port for pipelock's forward proxy.
-PIPELOCK_PORT = os.environ.get("CLAUDE_BOTTLE_PIPELOCK_PORT", "8888")
-
 # Baked-in default allowlist for hosts Claude Code itself needs.
 DEFAULT_ALLOWLIST: tuple[str, ...] = (
     "api.anthropic.com",

tests/test_pipelock_image.py

@@ -5,7 +5,7 @@ docker."""
 import subprocess
 import unittest
 
-from claude_bottle.pipelock import PIPELOCK_IMAGE
+from claude_bottle.backend.docker.pipelock import PIPELOCK_IMAGE
 from tests._docker import skip_unless_docker
 
 

tests/test_pipelock_sidecar_smoke.py

@@ -12,8 +12,10 @@ import unittest
 import urllib.request
 from pathlib import Path
 
-from claude_bottle.backend.docker.pipelock import DockerPipelockProxy
-from claude_bottle.pipelock import PIPELOCK_IMAGE
+from claude_bottle.backend.docker.pipelock import (
+    PIPELOCK_IMAGE,
+    DockerPipelockProxy,
+)
 from tests._docker import skip_unless_docker
 from tests.fixtures import fixture_minimal