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/hina/test_gcov_collector.py

@@ -0,0 +1,35 @@
+"""GC-01~03: gcov_collector — COBOL 覆盖率采集"""
+
+import sys, os, tempfile
+from pathlib import Path
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..")))
+from hina.gcov_collector import collect_gcov
+
+
+def test_gcov_not_installed():
+    """GC-01: cobc 不在 PATH → available=False"""
+    # Use a temp dir that won't have .gcda/.gcno files
+    with tempfile.TemporaryDirectory() as tmp:
+        work = Path(tmp)
+        result = collect_gcov(work / "program.cbl", work)
+        assert isinstance(result, dict)
+        # available should be False or result has a status field
+        assert not result.get("available", True) or "reason" in result
+
+
+def test_gcov_no_data():
+    """GC-02: 无 .gcda/.gcno → available=False"""
+    with tempfile.TemporaryDirectory() as tmp:
+        cobol_src = Path(tmp) / "test.cbl"
+        cobol_src.write_text("PROGRAM-ID. TEST.")
+        result = collect_gcov(cobol_src, Path(tmp))
+        assert result.get("available") is False
+        assert "reason" in result
+
+
+def test_gcov_result_structure():
+    """返回的 dict 包含必要字段"""
+    with tempfile.TemporaryDirectory() as tmp:
+        result = collect_gcov(Path(tmp) / "nope.cbl", Path(tmp))
+        assert "available" in result
+        assert "reason" in result or "line_rate" in result