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/worker_test.go

@@ -286,4 +286,4 @@ func TestPathAfterListen(t *testing.T) {
 
 func contains(haystack, needle string) bool {
 	return len(haystack) >= len(needle) && (bytes.Contains([]byte(haystack), []byte(needle)))
-}
+}