MIL-006: Spoken Malay word

Review record RC-028 (Go, autonomous mode, not independent).

Task: MIL-006#1
Task: MIL-006#2
Task: MIL-006#3
Task: MIL-006#4
Task: MIL-006#5

src/flash_card/infrastructure/speech/null_speech.py

@@ -0,0 +1,18 @@
+"""Silent speech adapter.
+
+@file null_speech.py
+@brief NullSpeech, the SpeechPort used when speech is off or unavailable.
+"""
+
+
+class NullSpeech:
+    """Speaks nothing."""
+
+    def speak(self, text: str, language_code: str) -> None:
+        """Do nothing.
+
+        @param text The text, ignored.
+        @param language_code The language, ignored.
+        @return Nothing.
+        """
+        return None