NB-076
da5d1058e7
Add _detect_matching_structure(): detection based on control flow pattern, not variable naming conventions. Uses 5 structural signals: 1. READ + AT END + EOF pattern 2. PERFORM UNTIL with EOF condition 3. ELSE body with conditional READ (matching core) 4. IF comparing hyphenated fields (cross-file comparison) 5. Multi-file OPEN INPUT 5/5 signals → 0.55, 4/5 → 0.50, 3/5 → 0.40. Real-world impact: matching programs with key fields named CUST-CODE and ORDR-CODE (no '-KEY' in name) are now correctly detected. Also: - Rule engine type priority: main types (マッチング etc.) override secondary types (M:N, DIVIDE) when keyword confidence is low - has_structural_match injected into features so rule engine can use it - matching_vs_keybreak accepts equality IFs as matching evidence - New test: test_structural_matching_no_keyword() Regression: 764 passed (0 new failures).