chore: remove all pipelock references from tests, docs, and non-pipelock source

- Strip pipelock from all unit and integration test fixtures:
  proxy_plan fields removed from DockerBottlePlan/SmolmachinesBottlePlan
  constructors; pipelock-specific test classes deleted or renamed
- Update test_sidecar_init: remove test_pipelock_loses_egress_tokens,
  rename "pipelock" daemon fixtures to "git-gate" throughout
- Remove test_pipelock_binary_present_and_versioned from integration test
- Remove test_pipelock_answers_on_bundle_ip from smolmachines launch test
- Update _SANDBOX_BLOCK_MARKERS: remove "pipelock" marker (egress blocks)
- Dockerfile.sidecars: remove pipelock build stage and COPY; update layout
  comments and port table
- egress_entrypoint.sh: update comments now that egress is sole proxy
- Clean up pipelock references in comments/docstrings across backend,
  network, manifest, supervise, git_gate, yaml_subset, agent_provider,
  sidecar_bundle, sidecar_init, egress_addon_core modules

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bot_bottle/backend/docker/launch.py

@@ -116,15 +116,13 @@ def launch(
                 internal_network=internal_network,
                 egress_network=egress_network,
             )
-        egress_plan = plan.egress_plan
-        if egress_plan.routes:
-            egress_plan = dataclasses.replace(
-                egress_plan,
-                internal_network=internal_network,
-                egress_network=egress_network,
-                mitmproxy_ca_host_path=egress_ca_host,
-                mitmproxy_ca_cert_only_host_path=egress_ca_cert_only,
-            )
+        egress_plan = dataclasses.replace(
+            plan.egress_plan,
+            internal_network=internal_network,
+            egress_network=egress_network,
+            mitmproxy_ca_host_path=egress_ca_host,
+            mitmproxy_ca_cert_only_host_path=egress_ca_cert_only,
+        )
         supervise_plan = plan.supervise_plan
         if supervise_plan is not None:
             supervise_plan = dataclasses.replace(