feat: add benchmark-programs — 58 telecom COBOL test programs

作为子目录纳入系统，与核心测试管道协同

Co-Authored-By: Claude <noreply@anthropic.com>

benchmark-programs/cross-cutting/japanese/README.md

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+# Japanese Character Handling
+
+## Test Cases
+
+| Test ID | Description |
+|---------|-------------|
+| J-N001 | PIC N full-width field length (10 chars = 20 bytes) |
+| J-N002 | Move between PIC N fields |
+| J-N003 | N field with numeric data |
+| J-N004 | N field comparison |
+| J-N005 | N field with mixed content |
+| J-K001 | Half-width katakana in PIC X |
+| J-K002 | Katakana field move |
+| J-K003 | Empty X field |
+| J-K004 | STRING with X fields |
+| J-K005 | UNSTRING with X fields |
+| J-D001 | Shift-JIS 5C problem character (backslash) |
+| J-D002 | 7C problem character (pipe) |
+| J-D003 | Mixed 5C/7C characters |
+| J-D004 | Comparison with 5C/7C |
+| J-S001 | INSPECT TALLYING with X data |
+| J-S002 | INSPECT REPLACING with X data |
+| J-S003 | INSPECT CONVERTING with X data |
+
+## Features Covered
+- PIC N (national) character fields for full-width text
+- PIC X for half-width katakana
+- Shift-JIS ambiguous byte handling (0x5C, 0x7C)
+- INSPECT with TALLYING, REPLACING, CONVERTING
+- STRING and UNSTRING operations
+
+## Expected Results
+All 17 tests should display PASS.