fix(discord): recover Windows voice opus decoding

tests/gateway/test_discord_opus.py

@@ -1,6 +1,7 @@
 """Tests for Discord Opus codec loading — must use ctypes.util.find_library."""
 
 import inspect
+import types
 
 
 class TestOpusFindLibrary:
@@ -29,12 +30,34 @@ class TestOpusFindLibrary:
         assert "sys.platform" in source or "darwin" in source, \
             "Homebrew fallback must be guarded by macOS platform check"
 
+    def test_windows_bundled_discord_opus_dll_is_discovered(self, monkeypatch, tmp_path):
+        """Native Windows installs should try discord.py's bundled opus DLL."""
+        import plugins.platforms.discord.adapter as adapter
+
+        opus_py = tmp_path / "discord" / "opus.py"
+        bundled = opus_py.parent / "bin" / "libopus-0.x64.dll"
+        bundled.parent.mkdir(parents=True)
+        opus_py.write_text("# fake discord.opus module\n")
+        bundled.write_bytes(b"fake dll")
+
+        discord_stub = types.SimpleNamespace(
+            opus=types.SimpleNamespace(__file__=str(opus_py))
+        )
+        monkeypatch.setattr(adapter.sys, "platform", "win32")
+        monkeypatch.setattr(adapter.struct, "calcsize", lambda _fmt: 8)
+
+        assert adapter._find_discord_windows_bundled_opus(discord_stub) == str(
+            bundled.resolve()
+        )
+
     def test_opus_decode_error_logged(self):
         """Opus decode failure must log the error, not silently return."""
         from plugins.platforms.discord.adapter import VoiceReceiver
         source = inspect.getsource(VoiceReceiver._on_packet)
         assert "logger" in source, \
             "_on_packet must log Opus decode errors"
+        assert "self._decoders.pop" in source, \
+            "_on_packet must reset the Opus decoder after decode failures"
         # Must not have bare `except Exception:\n            return`
         lines = source.split("\n")
         for i, line in enumerate(lines):