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/App.py

@@ -6,7 +6,7 @@ import os
 import sys
 
 from argparse import ArgumentDefaultsHelpFormatter, ArgumentParser, Namespace
-from typing import TYPE_CHECKING, Any
+from typing import override, TYPE_CHECKING, Any
 
 from .AsyncRunner import AsyncRunner
 from .log import DEBUG, ERR, NOTICE, log, log_m, set_log_flags, set_log_level
@@ -192,6 +192,7 @@ class App:  # export
 
             class NoopCompleter(BaseCompleter):
 
+                @override
                 def __call__(self, *args, **kwargs):
                     return None