feat: add detailed method changes in compatibility analysis and update tests

tests/test_compat.py

@@ -72,6 +72,9 @@ def test_divergent_surface_raises_asterisk():
     assert [m["game"] for m in div["members"]] == ["Game C"]
     assert div["vs_reference"]["axes"]["methods"] == {"added": 1, "removed": 0, "changed": 0}
     assert 0 < div["vs_reference"]["overall"] < 100
+    # named detail: *which* class gained *which* method
+    by_owner = div["vs_reference"]["detail"]["methods"]["by_owner"]
+    assert by_owner["CMC_Animo"]["added"] == ["PAUSE"]
 
     assert lib["cells"]["Game A"]["diverges"] is False
     assert lib["cells"]["Game C"]["diverges"] is True
@@ -116,6 +119,8 @@ def test_markdown_has_matrix_and_asterisk():
     assert "PIKLIB8.dll" in md
     assert "\\*" in md                      # the divergence marker survives to the table
     assert "vs **A**" in md                 # the footnote carries the delta
+    assert "**CMC_Animo**" in md            # named per-class breakdown
+    assert "+PAUSE" in md                   # the concrete added method
 
 
 def test_json_round_trips():