cmds.pkg.CmdVerify: Add command

Add the "packages verify" command: it runs Distro.verify() with the app's
package filter and prints one line per flagged file.

Signed-off-by: Jan Lindemann <jan@janware.com>
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v1.2.0

src/python/jw/pkg/cmds/pkg/CmdVerify.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, override
+
+from .Cmd import Cmd, Parent
+
+if TYPE_CHECKING:
+    from argparse import ArgumentParser, Namespace
+
+class CmdVerify(Cmd):  # export
+
+    def __init__(self, parent: Parent) -> None:
+        super().__init__(
+            parent,
+            'verify',
+            help = (
+                'Verify the integrity of installed packages: report files'
+                ' modified or deleted outside of the package manager'
+            )
+        )
+
+    @override
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)
+
+    @override
+    async def _run(self, args: Namespace) -> None:
+        for file in await self.distro.verify():
+            print(file)