feat: Phase 2 complete — 13 Phases of COBOL type classification and test benchmark

P0.6: gcov infrastructure
P1: extract_structure output expansion (11 new feature fields)
P2: Confusion group rule engine (8 pairs + contradiction + backtrack)
P3: 4-factor confidence calculation + quality gate update
P4: 33+2 COBOL program type test samples (22 files, 7 categories)
P5: parametrized/ test data generation engine
P6: japanese_data.py lookup tables
P7-10: Type-specific test suites (~159 parametrized tests)
P11: Full classification pipeline (classify_program) + orchestrator integration
P12: Documentation (module-interfaces, test-plan v3.0, coverage-matrix)

Architecture decisions:
- classification_pipeline/ merged to hina/pipeline/
- parametrized/ as independent module
- japanese_data.py as root-level file
- hina/__all__ only exports classify_program()

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_quality.py

@@ -0,0 +1,33 @@
+"""QL-01~04: Quality — L1OffsetValidator / L2RoundtripValidator"""
+
+import sys, os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+from quality.l1_offset_validate import L1OffsetValidator
+from quality.l2_value_roundtrip import L2RoundtripValidator
+from data.field_tree import FieldTree, Field
+
+
+def test_l1_validate():
+    """QL-01: L1 validate runs (可能无 cobc)"""
+    v = L1OffsetValidator()
+    tree = FieldTree(fields=[Field(name="WS-A", level=5, pic="9(4)")])
+    result = v.validate(tree, "/tmp/test.cbl")
+    assert "score" in result or "mismatches" in result
+
+
+def test_l2_no_comp3():
+    """QL-03: 无 COMP-3 → pass=True"""
+    v = L2RoundtripValidator()
+    tree = FieldTree(fields=[Field(name="WS-A", level=5, pic="9(4)")])
+    result = v.validate(tree)
+    assert result["pass"] is True
+
+
+def test_l2_with_comp3():
+    """QL-04: 有 COMP-3 → 字段值正确"""
+    v = L2RoundtripValidator()
+    tree = FieldTree(fields=[Field(name="WS-AMT", level=5, pic="S9(7)V99",
+                                    usage="COMP-3", length=5)])
+    result = v.validate(tree)
+    assert result["pass"] is True
+    assert len(result["results"]) >= 1