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/30-keybreak-other/README.md

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+# 30-keybreak-other — Key Break Non-Summary Change Detector
+
+## 电信业务场景
+
+通话状态变化检测。对已排序的通话状态记录进行key切变化检测，当通话状态(待接听/通话中/已结束)发生变化时输出标记行。
+
+Detects key changes without aggregation:
+
+- Compare WS-PREV-KEY to detect key changes in sorted input
+- On key change: write "*** KEY CHANGE TO: <KEY> ***" marker line
+- No aggregation — every data record is written to output unchanged
+- First record always starts with a marker line
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `main-30-keybreak-other.cbl` | COBOL program (fixed format) |
+| `data-gen.sh` | Generate sorted test data (4 groups) |
+| `run.sh` | Compile, run, display output |
+
+## Input Record
+
+| Field | Type | Length |
+|-------|------|--------|
+| KEY | PIC X | 10 |
+| DATA | PIC X | 30 |
+
+## Output
+
+Data records written as-is, with marker lines inserted before
+each new key group. Single-record groups produce a marker
+followed immediately by the data record.