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/cmds/posix/tar/Cmd.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from contextlib import asynccontextmanager
-from typing import TYPE_CHECKING
+from typing import override, TYPE_CHECKING
 
 from ....CmdBase import CmdBase as Base
 from ....lib.FileContext import FileContext
@@ -27,6 +27,7 @@ class Cmd(Base):  # export
             )
             yield ret
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument(

src/python/jw/pkg/cmds/posix/tar/CmdExtract.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from ....lib.log import DEBUG, log
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, override
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -12,10 +12,12 @@ class CmdExtract(Cmd):  # export
     def __init__(self, parent: Parent) -> None:
         super().__init__(parent, 'x', help = 'Extract a tar archive')
 
+    @override
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
         parser.add_argument('dst', help = 'Destination root URI')
 
+    @override
     async def _run(self, args: Namespace) -> None:
         async with self.ctx(dst = args.dst) as ctx:
             paths = await ctx.extract(ctx.dst.root)