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/33-mix-1N-diffkeybreak/README.md

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+# 33-mix-1N-diffkeybreak — 1:N Matching with Different-Key Break
+
+## 电信业务场景
+
+线路+类型混合切替。先做线路↔通话类型的关联，再检测通话类型的变化。用于不同通话类型(语音/SMS/数据)的计费切换。
+
+## Purpose
+Demonstrates 1:N matching pattern where the key break detection uses a different key field than the match key, showing master-to-detail transitions.
+
+## Test Coverage
+1. **1:N matching** — One master (M0001) matched to three details
+2. **Different-key break** — Key break is triggered by master ID change (M0001 -> M0002 -> M0003 -> M0004)
+3. **Unmatched master ID** — Detail with M9999 has no matching master
+4. **Summary per break** — Count and total per master ID group
+5. **Final break** — Last group summary at end of file
+
+## Data
+- 4 master records (M0001 through M0004) with names, types, amounts
+- 10 detail records with master ID references
+
+## Key Techniques
+- In-memory master table loaded at startup
+- Key break on master ID field (different from detail transaction ID)
+- Accumulator per break group
+- Grand total across all groups
+- Unmatched ID detection and reporting