refactor(docker): drop legacy supervise_container_name alias

Supervise runs inside the sidecar bundle (PRD 0024), not in its own
container. The `claude-bottle-supervise-<slug>` per-sidecar name only
existed as a docker-network alias on the bundle so legacy code paths
that referenced the old name would still resolve. Nothing inside the
project relies on that resolution anymore — the short `supervise`
alias is the one all consumers use — so the legacy long-form is dead.

Drops the function entirely, plus its registration as a network alias
and as an orphan probe in prepare.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

claude_bottle/backend/docker/compose.py

@@ -83,7 +83,6 @@ from .sidecar_bundle import (
     SIDECAR_BUNDLE_IMAGE,
     sidecar_bundle_container_name,
 )
-from .supervise import supervise_container_name
 
 
 # Repo root, used as the build context for the bundle Dockerfile.
@@ -246,7 +245,6 @@ def _sidecar_bundle_service(plan: DockerBottlePlan) -> dict[str, Any]:
         internal_aliases.append(git_gate_container_name(plan.slug))
     if sp is not None:
         internal_aliases.append(SUPERVISE_HOSTNAME)
-        internal_aliases.append(supervise_container_name(plan.slug))
 
     service: dict[str, Any] = {
         "image": SIDECAR_BUNDLE_IMAGE,