feat(runtime): implement single-article consolidation runtime and modularize codebase

tests/runtime/quality/test_golden_reference_20.py

@@ -0,0 +1,23 @@
+"""Multi-extractor golden-set quality tests across the 20 reference units."""
+
+import json
+from pathlib import Path
+
+from src.runtime.candidate.parser import build_candidates_payload
+from src.runtime.hygiene.harness import execute_deterministic_hygiene_fallback
+
+
+def test_golden_set_all_20_reference_cases_process_cleanly():
+    ref_dir = Path("evals/reference_20")
+    files = list(ref_dir.glob("article_*.json"))
+    assert len(files) == 20, f"Expected 20 reference unit files, found {len(files)}"
+
+    for f in sorted(files):
+        data = json.loads(f.read_text(encoding="utf-8"))
+        payload = build_candidates_payload(data)
+
+        # Verify deterministic extraction works for all 20 units
+        md, meta = execute_deterministic_hygiene_fallback(payload)
+        assert len(md) > 0
+        assert meta["title"] is not None
+        assert meta["kept_block_count"] >= 1