cli: accept --json/-v/-q on every subcommand, not only top level

Before this change, only the top-level parser defined --json, -v and -q.
Argparse processes arguments left-to-right and hands off to the subparser
after seeing the subcommand name, so the idiomatic

    metin-release release inspect --source X --json

failed with 'unrecognized arguments: --json'. Users had to write

    metin-release --json release inspect --source X

which is the opposite of what every modern CLI does. Attach a shared
--json/-v/-q flag set to every subparser via a small helper. Same dest
means the last occurrence on the command line wins, which is the intuitive
behaviour. Both placements are now accepted; tests unchanged.

src/metin_release/cli.py

@@ -26,15 +26,27 @@ from .workspace import Context
 CommandFn = Callable[[Context, argparse.Namespace], Result]
 
 
+def _add_common_flags(p: argparse.ArgumentParser) -> None:
+    """Attach --json / -v / -q to a parser.
+
+    These flags are accepted both at the top level and on each subcommand so
+    that users can write either `metin-release --json release inspect ...` or
+    the more common `metin-release release inspect ... --json`. The shared
+    `dest` means whichever occurrence argparse sees last wins, which is the
+    intuitive "last flag on the command line" behaviour.
+    """
+    p.add_argument("--json", action="store_true", help="Emit only JSON on stdout.")
+    p.add_argument("-v", "--verbose", action="store_true", help="Verbose stderr logging.")
+    p.add_argument("-q", "--quiet", action="store_true", help="Suppress stderr logging.")
+
+
 def _build_parser() -> argparse.ArgumentParser:
     parser = argparse.ArgumentParser(
         prog="metin-release",
         description="Orchestration CLI for Metin2 client releases.",
     )
     parser.add_argument("--version", action="version", version=f"metin-release {__version__}")
-    parser.add_argument("--json", action="store_true", help="Emit only JSON on stdout.")
-    parser.add_argument("-v", "--verbose", action="store_true", help="Verbose stderr logging.")
-    parser.add_argument("-q", "--quiet", action="store_true", help="Suppress stderr logging.")
+    _add_common_flags(parser)
 
     sub = parser.add_subparsers(dest="group", metavar="<group>")
     sub.required = True
@@ -43,14 +55,18 @@ def _build_parser() -> argparse.ArgumentParser:
     rsub = release.add_subparsers(dest="cmd", metavar="<command>")
     rsub.required = True
 
-    inspect.add_parser(rsub)
-    build_manifest.add_parser(rsub)
-    sign.add_parser(rsub)
-    diff_remote.add_parser(rsub)
-    upload_blobs.add_parser(rsub)
-    promote.add_parser(rsub)
-    verify_public.add_parser(rsub)
-    publish.add_parser(rsub)
+    for mod in (
+        inspect,
+        build_manifest,
+        sign,
+        diff_remote,
+        upload_blobs,
+        promote,
+        verify_public,
+        publish,
+    ):
+        sp = mod.add_parser(rsub)
+        _add_common_flags(sp)
 
     return parser