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/cobol_testgen/test_output.py

@@ -0,0 +1,45 @@
+"""OU-01~02: cobol_testgen output 模块 — JSON / 输入文件输出"""
+
+import sys, os, json, tempfile
+from pathlib import Path
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..")))
+from cobol_testgen.output import output_json, output_input_files
+
+
+def test_output_json_basic():
+    """OU-01: 3条记录 → 有效 JSON"""
+    records = [{"WS-A": "1", "WS-B": "2"}, {"WS-A": "3", "WS-B": "4"}]
+    with tempfile.TemporaryDirectory() as tmp:
+        outpath = Path(tmp) / "output.json"
+        output_json(records, outpath)
+        assert outpath.exists()
+        data = json.loads(outpath.read_text(encoding="utf-8"))
+        assert len(data) == 2
+        assert data[0]["WS-A"] == "1"
+
+def test_output_json_with_roles():
+    """带角色分组的 JSON 输出"""
+    records = [{"WS-A": "1", "WS-B": "2"}]
+    roles = {"WS-A": "input", "WS-B": "output"}
+    fd_fields = {"FILE1": {"WS-A"}}
+    field_to_fd = {"WS-A": "FILE1"}
+    open_dir = {"FILE1": "INPUT"}
+    with tempfile.TemporaryDirectory() as tmp:
+        outpath = Path(tmp) / "output.json"
+        output_json(records, outpath, roles, fd_fields, field_to_fd, open_dir)
+        assert outpath.exists()
+
+def test_output_json_empty():
+    """空记录 → 空数组"""
+    with tempfile.TemporaryDirectory() as tmp:
+        outpath = Path(tmp) / "empty.json"
+        output_json([], outpath)
+        assert json.loads(outpath.read_text(encoding="utf-8")) == []
+
+def test_output_input_files_basic():
+    """OU-02: 输入文件输出"""
+    records = [{"WS-A": "1"}]
+    roles = {"WS-A": "input"}
+    with tempfile.TemporaryDirectory() as tmp:
+        output_input_files(records, tmp, "TESTPGM", roles, {}, {}, {})
+        assert os.path.isdir(tmp)