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/config/test_config.py

@@ -0,0 +1,37 @@
+"""CF-01~07: Config + MappingConfig"""
+
+import sys, os, tempfile, json
+from pathlib import Path
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..")))
+from config import Config
+
+
+def test_config_defaults():
+    """CF-01: 默认值"""
+    c = Config()
+    assert c.runner_mode == "native"
+    assert hasattr(c, "llm_model")
+
+
+def test_config_from_toml(tmp_path):
+    """CF-02: from_toml 有效文件"""
+    p = tmp_path / "aurak.toml"
+    p.write_text('[runner]\nmode = "spark"\n[llm]\nmodel = "gpt-4"\n')
+    c = Config.from_toml(str(p))
+    assert c.runner_mode == "spark"
+    assert c.llm_model == "gpt-4"
+
+
+def test_config_from_toml_not_found():
+    """CF-03: 文件不存在 → 默认值"""
+    c = Config.from_toml("/nonexistent/aurak.toml")
+    assert c.runner_mode == "native"
+
+
+def test_config_from_toml_invalid():
+    """CF-04: 非法 TOML → 返回默认"""
+    with tempfile.TemporaryDirectory() as tmp:
+        p = Path(tmp) / "bad.toml"
+        p.write_text("= invalid toml [[[")
+        c = Config.from_toml(str(p))
+        assert c is not None