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_csv/CV01_CSV_NO_NEWLINE.cbl

@@ -0,0 +1,24 @@
+      * ==== TYPE: CV01 CSV(NO NEWLINE) ====
+      * FEATURE: STRING concatenation without newline
+      * BRANCHES: 2, DECISIONS: 1
+       IDENTIFICATION DIVISION.
+       PROGRAM-ID. CV01.
+       DATA DIVISION.
+       WORKING-STORAGE SECTION.
+       01 WS-FIELD1 PIC X(10) VALUE 'ALPHA'.
+       01 WS-FIELD2 PIC X(10) VALUE 'BETA'.
+       01 WS-FIELD3 PIC X(10) VALUE 'GAMMA'.
+       01 WS-CSV-LINE PIC X(100).
+       01 WS-PTR PIC 9(3) VALUE 1.
+       PROCEDURE DIVISION.
+       MAIN-PROCEDURE.
+           MOVE 1 TO WS-PTR.
+           STRING WS-FIELD1 DELIMITED BY SPACES
+                  ',' DELIMITED BY SIZE
+                  WS-FIELD2 DELIMITED BY SPACES
+                  ',' DELIMITED BY SIZE
+                  WS-FIELD3 DELIMITED BY SPACES
+                  INTO WS-CSV-LINE
+                  WITH POINTER WS-PTR.
+           DISPLAY 'CSV: ' WS-CSV-LINE.
+           STOP RUN.

test-data/cobol/category_csv/CV02_CSV_WITH_NEWLINE.cbl

@@ -0,0 +1,25 @@
+      * ==== TYPE: CV02 CSV(WITH NEWLINE) ====
+      * FEATURE: INSPECT REPLACING for newline handling
+      * BRANCHES: 2, DECISIONS: 1
+       IDENTIFICATION DIVISION.
+       PROGRAM-ID. CV02.
+       DATA DIVISION.
+       WORKING-STORAGE SECTION.
+       01 WS-LINE PIC X(100) VALUE
+          'FIELD1,FIELD2,FIELD3'.
+       01 WS-PTR PIC 9(3) VALUE 1.
+       01 WS-COM-COUNT PIC 9(3) VALUE 0.
+       PROCEDURE DIVISION.
+       MAIN-PROCEDURE.
+           INSPECT WS-LINE TALLYING WS-COM-COUNT
+               FOR ALL ','.
+           DISPLAY 'COMMA COUNT: ' WS-COM-COUNT.
+           INSPECT WS-LINE REPLACING ALL ',' BY '|'.
+           DISPLAY 'PIPE LINE: ' WS-LINE.
+           MOVE 1 TO WS-PTR.
+           STRING WS-LINE DELIMITED BY SPACES
+                  ';' DELIMITED BY SIZE
+                  INTO WS-LINE
+                  WITH POINTER WS-PTR.
+           DISPLAY 'CSV+TERM: ' WS-LINE.
+           STOP RUN.

test-data/cobol/category_csv/CV03_ASCII_EBCDIC.cbl

@@ -0,0 +1,27 @@
+      * ==== TYPE: CV03 ASCII-EBCDIC ====
+      * FEATURE: ASCII to EBCDIC conversion simulation
+      * BRANCHES: 2, DECISIONS: 1
+       IDENTIFICATION DIVISION.
+       PROGRAM-ID. CV03.
+       DATA DIVISION.
+       WORKING-STORAGE SECTION.
+       01 WS-ASCII-DATA PIC X(10) VALUE 'ABCDEF0123'.
+       01 WS-EBCDIC-DATA PIC X(10).
+       01 WS-I PIC 9(2) VALUE 1.
+       01 WS-CHAR PIC X(1).
+       PROCEDURE DIVISION.
+       MAIN-PROCEDURE.
+           MOVE SPACES TO WS-EBCDIC-DATA.
+           PERFORM VARYING WS-I FROM 1 BY 1 UNTIL WS-I > 10
+               MOVE WS-ASCII-DATA(WS-I:1) TO WS-CHAR
+               IF WS-CHAR >= 'A' AND <= 'Z'
+                   DISPLAY 'ALPHA AT ' WS-I
+               ELSE IF WS-CHAR >= '0' AND <= '9'
+                   DISPLAY 'DIGIT AT ' WS-I
+               ELSE
+                   DISPLAY 'OTHER AT ' WS-I
+               END-IF
+           END-PERFORM.
+           MOVE WS-ASCII-DATA TO WS-EBCDIC-DATA.
+           DISPLAY 'EBCDIC: ' WS-EBCDIC-DATA.
+           STOP RUN.