chore(types): add pyright strict config and fix resulting errors

Adds pyrightconfig.json (strict, Python 3.11) covering cli.py,
claude_bottle/, and tests/. Fixes the 49 strict-mode errors:

- Type DockerBottle.teardown as Callable[[], None].
- ResolvedEnv default_factory uses parameterized list[str] / dict[str, str].
- Erase BottleBackend generics at the registry boundary
  (BottleBackend[Any, Any]) since selection is runtime-driven and
  callers use the unparameterized interface.
- DockerBottleBackend.launch returns Generator[DockerBottle, None, None];
  @contextmanager now flags Iterator returns as deprecated.
- Sidestep cli.list submodule shadowing builtins.list in main()'s argv
  annotation via an aliased re-import in cli/__init__.py.
- Cast cfg[...] results in test_pipelock_yaml at the dict[str, object]
  boundary.
- Annotate write_fixture's fn parameter and _manifest_with_runtime's
  return type.

tests/fixtures.py

@@ -8,7 +8,7 @@ from __future__ import annotations
 import json
 import tempfile
 from pathlib import Path
-from typing import Any
+from typing import Any, Callable
 
 from claude_bottle.manifest import Manifest
 
@@ -77,7 +77,7 @@ def fixture_with_ssh() -> Manifest:
     return Manifest.from_json_obj(fixture_with_ssh_dict())
 
 
-def write_fixture(fn) -> Path:
+def write_fixture(fn: Callable[[], dict[str, Any]]) -> Path:
     """Write fixture JSON to a temp file; return the path. Caller must rm.
     Accepts a function returning either a dict (JSON shape) or a Manifest;
     only the dict form is supported here since we need to serialize."""