feat(discovery): derive core-album suggestions for surfaced artists

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

worker/tests/test_discovery_albums.py

@@ -0,0 +1,45 @@
+from lyra_worker.adapters.fakes import FakeMbBrowser, FakeSimilaritySource
+from lyra_worker.browser import ReleaseGroupInfo
+from lyra_worker.discovery import DiscoveryConfig, run_discovery
+from lyra_worker.similarity.base import SimilarArtist
+from tests.conftest import insert_monitored_release, insert_watched_artist
+
+
+def _album_rows(conn):
+    with conn.cursor() as cur:
+        cur.execute('SELECT "artistMbid", "rgMbid", album, "primaryType" '
+                    'FROM "DiscoverySuggestion" WHERE kind = \'album\' ORDER BY album')
+        return cur.fetchall()
+
+
+def test_derives_most_recent_core_album_for_surfaced_artist(conn):
+    insert_watched_artist(conn, mbid="s1", name="Seed")
+    src = FakeSimilaritySource(similar={"s1": [SimilarArtist("c1", "Cand", 0.9)]})
+    browser = FakeMbBrowser(releases={"c1": [
+        ReleaseGroupInfo("rg-old", "Debut", "Album", (), "2001-01-01"),
+        ReleaseGroupInfo("rg-new", "Latest", "Album", (), "2020-01-01"),
+        ReleaseGroupInfo("rg-live", "At The Hall", "Album", ("Live",), "2021-01-01"),
+    ]})
+    result = run_discovery(conn, [src], browser, DiscoveryConfig(albums_per_artist=1))
+    assert result.albums == 1
+    assert _album_rows(conn) == [("c1", "rg-new", "Latest", "Album")]  # newest core, live excluded
+
+
+def test_album_skips_release_groups_already_in_library(conn):
+    insert_watched_artist(conn, mbid="s1", name="Seed")
+    insert_monitored_release(conn, artist_mbid="c1", rg_mbid="rg-have", album="Owned")
+    src = FakeSimilaritySource(similar={"s1": [SimilarArtist("c1", "Cand", 0.9)]})
+    browser = FakeMbBrowser(releases={"c1": [
+        ReleaseGroupInfo("rg-have", "Owned", "Album", (), "2019-01-01"),
+        ReleaseGroupInfo("rg-fresh", "Fresh", "Album", (), "2018-01-01"),
+    ]})
+    run_discovery(conn, [src], browser, DiscoveryConfig(albums_per_artist=1))
+    assert _album_rows(conn) == [("c1", "rg-fresh", "Fresh", "Album")]  # owned rg excluded
+
+
+def test_albums_per_artist_zero_derives_none(conn):
+    insert_watched_artist(conn, mbid="s1", name="Seed")
+    src = FakeSimilaritySource(similar={"s1": [SimilarArtist("c1", "Cand", 0.9)]})
+    browser = FakeMbBrowser(releases={"c1": [ReleaseGroupInfo("rg1", "A", "Album", (), "2020")]})
+    assert run_discovery(conn, [src], browser, DiscoveryConfig(albums_per_artist=0)).albums == 0
+    assert _album_rows(conn) == []

worker/tests/test_release_filter.py

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+from lyra_worker.release_filter import is_core_release
+
+
+def test_core_studio_types_pass():
+    assert is_core_release("Album", ()) is True
+    assert is_core_release("Single", []) is True
+    assert is_core_release("EP", ()) is True
+
+
+def test_secondary_types_and_non_core_fail():
+    assert is_core_release("Album", ("Live",)) is False
+    assert is_core_release("Album", ("Compilation",)) is False
+    assert is_core_release("Broadcast", ()) is False
+    assert is_core_release("", ()) is False