App, cmds, lib: Fix Any returns from typed functions

Add type annotations and casts to functions that were returning Any
where a specific type was declared, satisfying the new warn_return_any
mypy rule.

Fixes:
- log.py: get_caller_pos return type via cast
- AsyncRunner.py: cast T for fut.result()
- util.py: cast for getattr result, str() for args.username
- FileContext.py: verbose_default bool annotation
- SSHClient.py: cast SSHClient for dynamic import
- lib/App.py: cast ArgumentParser, add return types to inner funcs
- pm/rpm.py, dpkg.py: cast Iterable[Package]
- App.py: cast for self.args.func(), add return types to inner funcs
- BaseCmdPkgRelations.py: cast str for args.delimiter

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/ec/ssh/AsyncSSH.py

@@ -1,4 +1,3 @@
-from typing import Any, override
 import asyncio
 import os
 import shlex
@@ -6,8 +5,12 @@ import shutil
 import signal
 import sys
 
+from typing import Any, override
+
 import asyncssh  # type: ignore[import-not-found, unused-ignore]
 
+from asyncssh import SSHReader  # type: ignore[import-not-found, unused-ignore]
+
 from ...base import Result
 from ...log import DEBUG, ERR, NOTICE, log
 from ..SSHClient import SSHClient as Base
@@ -22,10 +25,10 @@ class AsyncSSH(Base):
         uri: str,
         *,
         client_keys: list[str] | None = None,
-        known_hosts = _USE_DEFAULT_KNOWN_HOSTS,
+        known_hosts: Any = _USE_DEFAULT_KNOWN_HOSTS,
         term_type: str | None = None,
         connect_timeout: float | None = 30.0,
-        **kwargs,
+        **kwargs: Any,
     ) -> None:
 
         super().__init__(
@@ -121,8 +124,8 @@ class AsyncSSH(Base):
 
     async def _read_stream(
         self,
-        stream,
-        prio,
+        stream: SSHReader[bytes],
+        prio: int,
         collector: list[bytes],
         *,
         verbose: bool,
@@ -222,7 +225,7 @@ class AsyncSSH(Base):
                 stdout_parts.append(chunk)
                 _write_local(chunk)
 
-        def _on_winch(*_args) -> None:
+        def _on_winch(*_args: Any) -> None:
 
             try:
                 proc.change_terminal_size(*self._get_local_term_size())