fix(discord): accept metadata in media send methods

gateway/platforms/discord.py

@@ -251,6 +251,7 @@ async def send_voice(
         audio_path: str,
         caption: Optional[str] = None,
         reply_to: Optional[str] = None,
+        metadata: Optional[Dict[str, Any]] = None,
     ) -> SendResult:
         """Send audio as a Discord file attachment."""
         if not self._client:
@@ -289,6 +290,7 @@ async def send_image_file(
         image_path: str,
         caption: Optional[str] = None,
         reply_to: Optional[str] = None,
+        metadata: Optional[Dict[str, Any]] = None,
     ) -> SendResult:
         """Send a local image file natively as a Discord file attachment."""
         if not self._client:
@@ -326,6 +328,7 @@ async def send_image(
         image_url: str,
         caption: Optional[str] = None,
         reply_to: Optional[str] = None,
+        metadata: Optional[Dict[str, Any]] = None,
     ) -> SendResult:
         """Send an image natively as a Discord file attachment."""
         if not self._client:

tests/gateway/test_discord_media_metadata.py

@@ -0,0 +1,9 @@
+import inspect
+
+from gateway.platforms.discord import DiscordAdapter
+
+
+def test_discord_media_methods_accept_metadata_kwarg():
+    for method_name in ("send_voice", "send_image_file", "send_image"):
+        signature = inspect.signature(getattr(DiscordAdapter, method_name))
+        assert "metadata" in signature.parameters, method_name