feat: wire real YouTube adapter into the registry

worker/lyra_worker/registry.py

@@ -1,11 +1,12 @@
+from lyra_worker.adapters._ytdlp import YtDlpClient
 from lyra_worker.adapters.base import SourceAdapter
-from lyra_worker.adapters.fakes import FakeQobuz, FakeSoulseek, FakeYouTube
+from lyra_worker.adapters.youtube import YouTubeAdapter
 
 
 def build_adapters() -> list[SourceAdapter]:
-    """The enabled source adapters, best-tier first.
+    """The enabled real source adapters, best-tier first.
 
-    SWAP POINT: Plan 3 replaces these fakes with real Qobuz/Soulseek/YouTube
-    adapters (reading credentials from config). Nothing else in the pipeline changes.
+    Only real, usable adapters are returned. Plan 3c/3d add Qobuz (streamrip)
+    and Soulseek (slskd), each gated on its config being present via health().
     """
-    return [FakeQobuz(), FakeSoulseek(), FakeYouTube()]
+    return [YouTubeAdapter(YtDlpClient())]

worker/tests/test_registry.py

@@ -1,9 +1,17 @@
+from lyra_worker.adapters.youtube import YouTubeAdapter
 from lyra_worker.registry import build_adapters
 
 
-def test_registry_returns_the_three_fake_sources():
+def test_registry_returns_real_youtube_adapter():
     adapters = build_adapters()
-    names = sorted(a.name for a in adapters)
-    assert names == ["qobuz", "soulseek", "youtube"]
-    for a in adapters:
-        assert a.health() is True
+    names = [a.name for a in adapters]
+    assert "youtube" in names
+    yt = next(a for a in adapters if a.name == "youtube")
+    assert isinstance(yt, YouTubeAdapter)
+    assert yt.tier == 2
+    assert yt.health() is True
+
+
+def test_registry_adapter_names_are_unique():
+    names = [a.name for a in build_adapters()]
+    assert len(names) == len(set(names))