refactor(orchestrator): move registry into store/registry_store

registry.py is a SQLite-backed store (its class is already RegistryStore),
so it belongs with the other orchestrator-owned stores rather than at the
package root. Moved orchestrator/registry.py -> orchestrator/store/
registry_store.py, joining queue_store / secret_store / config_store.

Repointed the in-package importers (.registry -> .store.registry_store)
and the tests, bumped the moved file's relative-import depths, renamed
the test file to match, and listed it in the store package docstring.
Full unit suite green (2243).

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

tests/unit/test_orchestrator_registry_store.py

@@ -9,7 +9,7 @@ import unittest
 from contextlib import closing
 from pathlib import Path
 
-from bot_bottle.orchestrator.registry import (
+from bot_bottle.orchestrator.store.registry_store import (
     BottleRecord,
     RegistryStore,
     new_identity_token,

tests/unit/test_orchestrator_server.py

@@ -22,7 +22,7 @@ from unittest.mock import patch
 from bot_bottle.orchestrator_auth import ROLE_CLI, ROLE_GATEWAY, mint
 from bot_bottle.orchestrator.broker import StubBroker
 from bot_bottle.orchestrator.server import dispatch, make_server
-from bot_bottle.orchestrator.registry import BottleRecord, RegistryStore
+from bot_bottle.orchestrator.store.registry_store import BottleRecord, RegistryStore
 from bot_bottle.orchestrator.service import Orchestrator
 from bot_bottle.orchestrator.store.store_manager import StoreManager
 from bot_bottle.orchestrator.supervisor import (

tests/unit/test_orchestrator_service.py

@@ -12,7 +12,7 @@ from pathlib import Path
 from unittest.mock import patch
 
 from bot_bottle.orchestrator.broker import LaunchBroker, LaunchRequest, StubBroker
-from bot_bottle.orchestrator.registry import RegistryStore
+from bot_bottle.orchestrator.store.registry_store import RegistryStore
 from bot_bottle.orchestrator.service import Orchestrator
 from bot_bottle.orchestrator.store.secret_store import new_env_var_secret
 from bot_bottle.orchestrator.store.store_manager import StoreManager