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/prepare.py

@@ -40,7 +40,6 @@ from .bottle_state import (
     write_metadata,
 )
 from .pipelock import pipelock_container_name
-from .supervise import supervise_container_name
 
 
 def resolve_plan(
@@ -141,8 +140,6 @@ def resolve_plan(
         sidecar_probes.append(("git-gate", git_gate_container_name(slug)))
     if bottle.egress.routes:
         sidecar_probes.append(("egress", egress_container_name(slug)))
-    if bottle.supervise:
-        sidecar_probes.append(("supervise", supervise_container_name(slug)))
     for label, sidecar_name in sidecar_probes:
         if docker_mod.container_exists(sidecar_name):
             die(