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.

claude_bottle/backend/docker/backend.py

@@ -16,7 +16,7 @@ import subprocess
 import sys
 from contextlib import ExitStack, contextmanager
 from pathlib import Path
-from typing import Iterator, Sequence
+from typing import Generator, Sequence
 
 from ... import pipelock
 from ...env import ResolvedEnv, resolve_env
@@ -165,7 +165,7 @@ class DockerBottleBackend(BottleBackend["DockerBottlePlan", "DockerBottleCleanup
         env_file.chmod(0o600)
 
     @contextmanager
-    def launch(self, plan: DockerBottlePlan) -> Iterator[DockerBottle]:
+    def launch(self, plan: DockerBottlePlan) -> Generator[DockerBottle, None, None]:
         """Build, launch, and provision a Docker bottle. Teardown on exit."""
         stack = ExitStack()