feat: evaluate fetch results with "confidence"

tests/test_normalize.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+from lrx_cli.normalize import normalize_for_match, normalize_artist
+
+
+def test_normalize_for_match_covers_nfkc_punct_feat_and_whitespace() -> None:
+    text = "  Ｔｅｓｔ！  feat. SOMEONE  "
+
+    normalized = normalize_for_match(text)
+
+    assert normalized == "test"
+
+
+def test_normalize_artist_splits_separators_and_sorts_parts() -> None:
+    artist = "B / A feat. C; D vs. E × F 、 G"
+
+    normalized = normalize_artist(artist)
+
+    assert normalized == "a\0b\0d\0e\0f\0g"