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>

test-data/cobol/category_db/DB01_SELECT_UPDATE.cbl

@@ -0,0 +1,34 @@
+      * ==== TYPE: DB01 SELECT-UPDATE ====
+      *> FEATURE: EXEC SQL + INSERT/UPDATE simulation
+      *> NOTE: SQL keywords marked with *> not for compilation
+       IDENTIFICATION DIVISION.
+       PROGRAM-ID. DB01.
+       DATA DIVISION.
+       WORKING-STORAGE SECTION.
+       01 WS-EMP-ID     PIC X(10).
+       01 WS-EMP-NAME   PIC X(30).
+       01 WS-EMP-SALARY PIC 9(7)V99.
+       01 WS-SQLCODE    PIC S9(4) COMP.
+       01 WS-SQLMSG     PIC X(50).
+       PROCEDURE DIVISION.
+      *>    EXEC SQL
+      *>        SELECT EMP_NAME, EMP_SALARY
+      *>        INTO :WS-EMP-NAME, :WS-EMP-SALARY
+      *>        FROM EMPLOYEE
+      *>        WHERE EMP_ID = :WS-EMP-ID
+      *>    END-EXEC.
+           DISPLAY 'SELECTED: ' WS-EMP-NAME.
+      *>    EXEC SQL
+      *>        UPDATE EMPLOYEE
+      *>        SET EMP_SALARY = :WS-EMP-SALARY
+      *>        WHERE EMP_ID = :WS-EMP-ID
+      *>    END-EXEC.
+           DISPLAY 'UPDATED: ' WS-EMP-ID.
+      *>    EXEC SQL
+      *>        INSERT INTO EMPLOYEE
+      *>        (EMP_ID, EMP_NAME, EMP_SALARY)
+      *>        VALUES (:WS-EMP-ID, :WS-EMP-NAME,
+      *>                :WS-EMP-SALARY)
+      *>    END-EXEC.
+           DISPLAY 'INSERTED: ' WS-EMP-ID.
+           STOP RUN.