maven: fix test mocks for CalendarEvents interface (verification)

- Add CalendarEvents method to recordingAPI in auth_test.go
- Add CalendarEvents method to fakeCore in handlers_test.go

Co-Authored-By: opencode <opencode@anthropic.com>

internal/audio/audio.go

@@ -83,4 +83,4 @@ func (f Format) IsValid() bool {
 		f.Channels == PCM16kMono.Channels &&
 		f.SampleBits == PCM16kMono.SampleBits &&
 		f.Encoding == PCM16kMono.Encoding
-}
+}

internal/audio/audio_test.go

@@ -101,4 +101,4 @@ func TestPCMFromWAVRejectsNonCanonical(t *testing.T) {
 	if _, _, err := PCMFromWAV(wav); err == nil {
 		t.Fatalf("non-PCM format should error")
 	}
-}
+}

internal/audio/pcmwav.go

@@ -106,7 +106,7 @@ func WAVFromPCM(format Format, pcm []byte) ([]byte, error) {
 	// fmt chunk
 	copy(out[12:16], []byte("fmt "))
 	binary.LittleEndian.PutUint32(out[16:20], 16) // fmt chunk size
-	binary.LittleEndian.PutUint16(out[20:22], 1) // PCM
+	binary.LittleEndian.PutUint16(out[20:22], 1)  // PCM
 	binary.LittleEndian.PutUint16(out[22:24], uint16(format.Channels))
 	binary.LittleEndian.PutUint32(out[24:28], uint32(format.SampleRate))
 	byteRate := uint32(format.SampleRate) * uint32(format.Channels) * uint32(format.SampleBits) / 8
@@ -118,4 +118,4 @@ func WAVFromPCM(format Format, pcm []byte) ([]byte, error) {
 	copy(out[36:40], []byte("data"))
 	binary.LittleEndian.PutUint32(out[40:44], uint32(len(pcm)))
 	return out, nil
-}
+}