refactor: move bottle_state.py to top-level bot_bottle package

Both docker and smolmachines backends use bottle state helpers.
Moving to bot_bottle/ makes the sharing explicit and removes the
cross-backend dependency (smolmachines importing from ..docker).

All callers updated: docker backend, smolmachines backend, cli
modules, and tests.

tests/unit/test_bottle_state.py

@@ -7,8 +7,8 @@ import unittest
 from pathlib import Path
 
 from bot_bottle import supervise
-from bot_bottle.backend.docker import bottle_state
-from bot_bottle.backend.docker.bottle_state import (
+from bot_bottle import bottle_state
+from bot_bottle.bottle_state import (
     BottleMetadata,
     read_metadata,
     write_metadata,
@@ -260,7 +260,7 @@ class TestBottleMetadataBackend(_FakeHomeMixin, unittest.TestCase):
     def test_missing_backend_field_defaults_to_empty(self):
         # Old state dirs written before PRD 0040 have no backend key.
         import json
-        from bot_bottle.backend.docker import bottle_state as bs
+        from bot_bottle import bottle_state as bs
         path = bs.metadata_path("dev-b3")
         path.parent.mkdir(parents=True, exist_ok=True)
         path.write_text(json.dumps({

tests/unit/test_capability_apply.py

@@ -13,7 +13,8 @@ import unittest
 from pathlib import Path
 
 from bot_bottle import supervise
-from bot_bottle.backend.docker import bottle_state, capability_apply
+from bot_bottle import bottle_state
+from bot_bottle.backend.docker import capability_apply
 from bot_bottle.backend.docker.capability_apply import (
     CapabilityApplyError,
     apply_capability_change,

tests/unit/test_cli_start_settle.py

@@ -9,7 +9,7 @@ import unittest
 from pathlib import Path
 
 from bot_bottle import supervise
-from bot_bottle.backend.docker import bottle_state
+from bot_bottle import bottle_state
 from bot_bottle.cli import start as start_mod
 
 

tests/unit/test_docker_cleanup.py

@@ -16,7 +16,7 @@ import unittest
 from pathlib import Path
 
 from bot_bottle import supervise
-from bot_bottle.backend.docker import bottle_state
+from bot_bottle import bottle_state
 from bot_bottle.backend.docker.cleanup import _list_orphan_state_dirs
 
 

tests/unit/test_docker_enumerate_active.py

@@ -24,7 +24,8 @@ import unittest
 from pathlib import Path
 
 from bot_bottle import supervise
-from bot_bottle.backend.docker import bottle_state, enumerate as _enumerate
+from bot_bottle import bottle_state
+from bot_bottle.backend.docker import enumerate as _enumerate
 
 
 class TestParseServicesByProject(unittest.TestCase):

tests/unit/test_supervise_cli.py

@@ -289,7 +289,7 @@ class TestCapabilityBlockSmolmachinesGuard(_FakeHomeMixin, unittest.TestCase):
         return supervise_cli.QueuedProposal(proposal=p, queue_dir=qdir)
 
     def _write_metadata(self, slug: str, compose_project: str) -> None:
-        from bot_bottle.backend.docker.bottle_state import BottleMetadata, write_metadata
+        from bot_bottle.bottle_state import BottleMetadata, write_metadata
         write_metadata(BottleMetadata(
             identity=slug,
             agent_name="myagent",