Start listening for expected follow-ups

Propagate the master's follow-up decision to slave devices and skip wake-word detection for one turn after response playback.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/test_slave_audit.py

@@ -143,6 +143,63 @@ def test_send_turn_retries_connect_error_once():
     assert len(calls) == 2
 
 
+def test_send_turn_reads_master_followup_flag():
+    def handler(request):
+        return httpx.Response(
+            200,
+            json={
+                "user_text": "Ja",
+                "reply_text": "Noch etwas?",
+                "expects_followup": True,
+            },
+        )
+
+    async def run():
+        client = _client_with(handler)
+        try:
+            return await client.send_turn(b"RIFF")
+        finally:
+            await client.aclose()
+
+    result = asyncio.run(run())
+    assert result.expects_followup is True
+
+
+def test_slave_followup_skips_wake_word_and_starts_recording():
+    from javis_slave.audio_engine import AudioEngine
+
+    async def run():
+        eng = AudioEngine(SlaveConfig(), client=None)
+        eng._followup_pending = True
+        calls = []
+
+        async def config_poll():
+            await eng._stop.wait()
+
+        async def wait_for_wake():
+            calls.append("wake")
+            return True
+
+        async def handle_turn(*, is_followup=False):
+            calls.append(("turn", is_followup))
+            eng._stop.set()
+
+        async def play_chime(*args):
+            calls.append("chime")
+
+        eng._config_poll_loop = config_poll
+        eng._wait_for_wake = wait_for_wake
+        eng._handle_turn = handle_turn
+        eng._play_chime = play_chime
+        await eng.run()
+        await asyncio.sleep(0)
+        return calls
+
+    calls = asyncio.run(run())
+    assert "wake" not in calls
+    assert ("turn", True) in calls
+
+
 # ── SLV-04 / SLV-06: audio engine ────────────────────────────────────────────
 
 def test_engine_start_failure_releases_mic(monkeypatch):