Fix: increase Opus buffer size to 1500 bytes and add bounds check

internal/audio/cgo_source.go

@@ -21,7 +21,7 @@ import (
 )
 
 const (
-	ipcMaxFrameSize = 1024
+	ipcMaxFrameSize = 1500
 )
 
 type CgoSource struct {
@@ -184,6 +184,10 @@ func (c *CgoSource) ReadMessage() (uint8, []byte, error) {
 		return 0, nil, nil
 	}
 
+	if int(opusSize) > len(c.opusBuf) {
+		return 0, nil, fmt.Errorf("opus packet too large: %d > %d", opusSize, len(c.opusBuf))
+	}
+
 	return ipcMsgTypeOpus, c.opusBuf[:opusSize], nil
 }