App, lib, cmds: Fix mypy.explicit-override fallout

This commit adds @override decorators to approximately 300 methods
across 76 files that inherit from base classes such as AbstractCmd,
FileContext, ExecContext, Distro, SSHClient, and others.

The decorator ensures the type checker can verify that overridden
methods have compatible signatures and prevents accidental shadowing
of inherited methods without intent.

Files modified include command classes, library modules, distro
implementations, and SSH client implementations.

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

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

@@ -4,7 +4,7 @@ import abc
 
 from enum import Enum, auto
 from functools import cached_property
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from .log import DEBUG, ERR, log
 from .Uri import Uri
@@ -50,6 +50,7 @@ class FileContext(abc.ABC):
     async def __aexit__(self, exc_type, exc, tb):
         await self.close()
 
+    @override
     def __repr__(self) -> str:
         return self.__uri.id