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/worker/handler.go

@@ -22,4 +22,4 @@ type Transcriber interface {
 // so a server asked for the wrong verb refuses cleanly).
 type Synthesizer interface {
 	Synthesize(ctx context.Context, req SynthesizeReq) (SynthesizeResp, error)
-}
+}