refactor(cli): group subcommand handlers under cli/commands/

Move the eleven per-command modules (backend, cleanup, commit, edit,
info, init, list, login, resume, start, supervise) into a new
bot_bottle/cli/commands/ package, leaving the dispatcher (__init__),
entrypoint (__main__), and shared helpers (_common, tui) at the cli
root. Makes the command surface obvious at a glance and separates
handlers from the plumbing that registers them.

Updated the dispatcher's COMMANDS imports to .commands.*, bumped the
moved files' relative-import depths (.._common, .. import tui, sibling
.start unchanged), and repointed test references to
bot_bottle.cli.commands.*. Full unit suite green (2243); CLI dispatch
verified via `python -m bot_bottle.cli --help`.

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

tests/unit/test_cli_start_stale.py

@@ -56,7 +56,7 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
         )
 
     def _run_launch(self, **patch_kwargs: Any) -> int:
-        import bot_bottle.cli.start as start_mod
+        import bot_bottle.cli.commands.start as start_mod
         spec = self._spec()
         with patch.object(start_mod, "prepare_with_preflight",
                           return_value=(_fake_plan(), "dev-abc")), \
@@ -71,7 +71,7 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
 
     def test_headless_stale_calls_die(self) -> None:
         """In headless mode (assume_yes=True), a StaleImageError from prelaunch_checks must call die()."""
-        import bot_bottle.cli.start as start_mod
+        import bot_bottle.cli.commands.start as start_mod
 
         backend_mock = MagicMock()
         backend_mock.prelaunch_checks.side_effect = StaleImageError("image is 5 day(s) old")
@@ -85,7 +85,7 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
 
     def test_interactive_user_declines_stops_before_launch(self) -> None:
         """Interactive user answering 'n' → launch is never called."""
-        import bot_bottle.cli.start as start_mod
+        import bot_bottle.cli.commands.start as start_mod
 
         backend_mock = MagicMock()
         backend_mock.prelaunch_checks.side_effect = StaleImageError("image is 5 day(s) old")
@@ -100,7 +100,7 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
 
     def test_interactive_user_confirms_launches_once(self) -> None:
         """Interactive user answering 'y' → prelaunch stale error is bypassed; launch called once."""
-        import bot_bottle.cli.start as start_mod
+        import bot_bottle.cli.commands.start as start_mod
 
         bottle_mock = MagicMock()
         bottle_mock.name = "dev-abc"
@@ -122,7 +122,7 @@ class TestLaunchBottleStaleHandling(unittest.TestCase):
 
     def test_interactive_yes_uppercase_also_accepted(self) -> None:
         """'Y' or 'YES' should also be accepted as confirmation."""
-        import bot_bottle.cli.start as start_mod
+        import bot_bottle.cli.commands.start as start_mod
 
         bottle_mock = MagicMock()
         bottle_mock.name = "dev-abc"