fix(tests): update test_extract_mp_votes for party-level actor inclusion

New extract_mp_votes behavior inserts all actors (party + individual MPs),
not only comma-name MPs. Test now validates both types and their party column.
Also adds generated HTML visualizations (political axis x5 windows + trajectories).

tests/test_extract_mp_votes.py

@@ -47,26 +47,29 @@ def test_extract_mp_votes(tmp_path):
     # Run extraction
     res = extract_mp_votes(db_path=str(db_file))
 
-    # Expected MP rows: count keys that contain a comma in fixtures
-    expected_mp_count = 0
-    for item in fixtures:
-        for k in item.get("voting_results", {}).keys():
-            if "," in k:
-                expected_mp_count += 1
+    # Expected rows: ALL actors (both individual MPs and party-level), across all motions
+    expected_total = sum(len(item.get("voting_results", {})) for item in fixtures)
 
-    assert res["mp_rows_inserted"] == expected_mp_count
+    assert res["mp_rows_inserted"] == expected_total
     assert res["motions_skipped"] == 0
 
-    # Verify mp_votes table contains only rows with comma in mp_name and count matches
+    # Verify row count matches and both comma-name (individual) and no-comma (party) actors present
     conn = duckdb.connect(str(db_file))
     try:
-        rows = conn.execute("SELECT mp_name FROM mp_votes").fetchall()
+        rows = conn.execute("SELECT mp_name, party FROM mp_votes").fetchall()
     finally:
         conn.close()
 
-    assert len(rows) == expected_mp_count
-    for (mp_name,) in rows:
-        assert "," in mp_name
+    assert len(rows) == expected_total
+
+    # Individual MPs (comma in name) should have party = None (metadata not yet fetched)
+    # Party-level actors (no comma) should have party = mp_name
+    for mp_name, party in rows:
+        if "," not in mp_name:
+            # Party-level actor: party column should equal the actor name
+            assert party == mp_name, (
+                f"Party actor '{mp_name}' should have party=mp_name, got {party!r}"
+            )
 
     # Running again should be idempotent: no new mp rows, motions_skipped > 0
     res2 = extract_mp_votes(db_path=str(db_file))