fix: L1キーワード部分文字列FPを修正 - CALL/MAP/SYSIN/EXEC SQL

第三者監査で発見された4つの変数名起因のFPを修正:

FP1: WS-CALL-COUNT → 子程序调用（変数名にCALL）
FP2: WS-MAP-FIELD → online（変数名にMAP）
FP3: 01 SYSIN PIC X(80) → SYSIN（変数名がSYSIN）
FP4: DISPLAY 'EXEC SQL...' → DB操作（文字列リテラル内）

対策:
- CALL: re:\s*CALL\s （行頭のCALL文のみ）
- EXEC SQL: re:(?:\n|^)\s*EXEC\s+SQL（行頭でのみ）
- SYSIN: re:\s*ACCEPT\s+\S+\s+FROM\s+SYSIN（FROM SYSIN形式限定）
- MAP: L1ルールから削除（DFHCOMMAREAのみに）
- CI01サンプル: WS-COMMAREA→DFHCOMMAREAに修正

回帰: 767 passed（0 new failures）

tests/hina/test_classifier_deep.py

@@ -34,11 +34,11 @@ def test_detect_keyword_multiple_matches():
     # Verify confidence values per match
     cat_map = {r[0]: (r[1], r[2]) for r in results}
     assert cat_map["DB操作"][0] == 0.95
-    assert cat_map["DB操作"][1] == "EXEC SQL"
+    assert cat_map["DB操作"][1].startswith("re:")  # regex pattern, not literal
     assert cat_map["SORT"][0] == 0.95
     assert cat_map["SORT"][1].startswith("re:SORT")  # regex pattern
     assert cat_map["子程序调用"][0] == 0.90
-    assert cat_map["子程序调用"][1] == "CALL"
+    assert cat_map["子程序调用"][1].startswith("re:")  # regex pattern
 
 
 # ── 2. compute_confidence with hybrid (keyword + LLM) result ──
@@ -151,8 +151,8 @@ def test_detect_keyword_mixed_case_whitespace_comments():
 
     # Verify matched keywords were found (function uppercases source)
     matched_keywords = {r[2] for r in results}
-    assert "EXEC SQL" in matched_keywords
-    assert "CALL" in matched_keywords
+    assert any(r[0] == "DB操作" for r in results)  # EXEC SQL via regex
+    assert any(r[0] == "子程序调用" for r in results)  # CALL via regex
     assert any(r[0] == "SORT" for r in results)  # SORT detected via regex
 
 
@@ -182,13 +182,12 @@ def test_compute_confidence_no_match_no_llm():
 def test_detect_keyword_all_rules():
     """Each L1_RULE category is detectable from a representative keyword"""
     test_cases = [
-        ("EXEC SQL", "DB操作"),
-        ("CALL", "子程序调用"),
+        ("       EXEC SQL", "DB操作"),
+        ("       CALL", "子程序调用"),
         ("IS INITIAL", "IS INITIAL"),
-        ("SYSIN", "SYSIN"),
+        ("       ACCEPT WS-D FROM SYSIN", "SYSIN"),
         ("ALPHABETIC", "编码转换"),
         ("DFHCOMMAREA", "online"),
-        ("MAP", "online"),
         ("SORT SORT-FILE ON KEY", "SORT"),
         ("MERGE MERGE-FILE ON KEY", "MERGE"),
         ("WRITE OUT AFTER", "编辑输出"),