Distro, Cmd, AsyncSSH: Fix bare generic types

Add explicit type arguments to all generic type annotations that were
previously bare, satisfying the new disallow_any_generics mypy rule.

Fixes:
- Distro.py: Iterable[str] for expand_macros fmt parameter
- Cmd.py: Types[Any] for add_subcommands cmds parameter
- AsyncSSH.py: dict[str, Any] for _connect_kwargs return type

Assisted-by: unsloth/Qwen3.6-35B-A3B-GGUF:IQ4_NL and pi.dev 0.81.1
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/Distro.py

@@ -278,7 +278,7 @@ class Distro(abc.ABC):
     def macros(cls) -> list[str]:
         return ['%%{' + name + '}' for name in cls.macro_names]
 
-    def expand_macros(self, fmt: str | Iterable) -> str | list[str]:
+    def expand_macros(self, fmt: str | Iterable[str]) -> str | list[str]:
         ret: str | list[str]
         if not isinstance(fmt, str):
             ret = []