refactor(supervise): split the supervise plane by tier; per-service store managers

Give each service its own store package + manager, and cut the supervise module
along the control/data-plane boundary so nothing in the shared layer reaches up
into the orchestrator.

Stores, by owner:
  - bot_bottle/store/ keeps only the shared base (DbStore, migrations) and the
    concrete stores that aren't service-owned (audit_store, config_store).
  - bot_bottle/orchestrator/store/ now houses the orchestrator-owned stores —
    queue_store (supervise queue), secret_store, config_store — plus a new
    orchestrator store_manager that migrates them (composing audit/config
    downward from the base). The old shared store_manager is gone.

Supervise plane, by tier:
  - bot_bottle/supervisor/ (NEUTRAL, importable by every tier including the
    gateway): types.py (the Proposal/Response/AuditEntry wire types + the tool/
    status/poll constants + the shared daemon constants moved out of
    supervise.py) and plan.py (SupervisePlan, a pure DTO).
  - bot_bottle/orchestrator/supervisor/ (orchestrator-only): queue.py (the
    queue/audit I/O wrappers + render_diff + sha256_hex) and supervise.py (the
    Supervise lifecycle that stages the DB via the store manager). Its __init__
    re-exports the neutral vocabulary so orchestrator-side callers import from
    one place.

The gateway now imports only bot_bottle.supervisor.types (never
bot_bottle.supervise), so the data plane holds no code dependency on the
orchestrator — it reaches the queue over the control-plane RPC. This removes
the circular import that moving queue_store under orchestrator introduced
(supervise -> orchestrator -> service -> supervise).

supervise_types.py -> supervisor/types.py; supervise.py deleted (split). Full
unit suite green (2251).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/unit/_docker_bottle_plan.py

@@ -16,7 +16,7 @@ from bot_bottle.backend.docker.bottle_plan import DockerBottlePlan
 from bot_bottle.egress import EgressPlan, EgressRoute
 from bot_bottle.git_gate import GitGatePlan, GitGateUpstream
 from bot_bottle.manifest import ManifestIndex
-from bot_bottle.supervise import SupervisePlan
+from bot_bottle.supervisor.plan import SupervisePlan
 
 
 SLUG = "demo-abc12"