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>

hina/rule_engine/__init__.py

@@ -0,0 +1,47 @@
+"""HINA 混淆组判定规则引擎
+
+公开 API:
+  resolve_confusion_pair()          — 根据 pair_name 调度对应函数
+  detect_contradictions()           — 检测可能矛盾的类型对
+  resolve_contradiction()           — 解决矛盾，返回胜出的类型名
+  BacktrackResolver                 — 多轮回溯判定
+"""
+
+from __future__ import annotations
+
+from .confusion_groups import (
+    resolve_confusion_pair,
+    resolve_matching_vs_keybreak,
+    resolve_dedup_vs_nodedup,
+    resolve_validation_vs_keybreak,
+    resolve_csv_merge_vs_split,
+    resolve_simple_vs_two_stage,
+    resolve_pure_vs_mixed,
+    resolve_division_50_25_100,
+    resolve_mn_output_mode,
+)
+from .contradiction import (
+    CONTRADICTION_PAIRS,
+    detect_contradictions,
+    resolve_contradiction,
+)
+from .backtrack import BacktrackResolver
+
+__all__ = [
+    # 混淆组判定
+    "resolve_confusion_pair",
+    "resolve_matching_vs_keybreak",
+    "resolve_dedup_vs_nodedup",
+    "resolve_validation_vs_keybreak",
+    "resolve_csv_merge_vs_split",
+    "resolve_simple_vs_two_stage",
+    "resolve_pure_vs_mixed",
+    "resolve_division_50_25_100",
+    "resolve_mn_output_mode",
+    # 矛盾检测与解决
+    "CONTRADICTION_PAIRS",
+    "detect_contradictions",
+    "resolve_contradiction",
+    # 回溯
+    "BacktrackResolver",
+]