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/34-sort/README.md

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+# 34-sort — SORT Processing Program
+
+## 电信业务场景
+
+CDR排序。使用SORT语句对CDR明细进行排序(按主叫号码升序/降序、通话时长多键排序)，支持INPUT/OUTPUT PROCEDURE。
+
+## Purpose
+Comprehensive demonstration of COBOL SORT statement capabilities, covering SR-N001 through SR-N010.
+
+## Test Coverage
+| ID | Test | Description |
+|----|------|-------------|
+| SR-N001 | Ascending SORT | USING INPUT-FILE / GIVING OUTPUT-FILE, ASCENDING KEY |
+| SR-N002 | Descending SORT | DESCENDING KEY sort |
+| SR-N003 | Multi-key SORT | ASCENDING KEY + DESCENDING KEY (mixed) |
+| SR-N004 | INPUT PROCEDURE | FILTER-INPUT section, only records with VALUE > 200 |
+| SR-N005 | OUTPUT PROCEDURE | SUMMARIZE-OUTPUT with key break totals |
+| SR-N006 | 0-record SORT | Empty input file |
+| SR-N007 | 1-record SORT | Single record input |
+| SR-N008 | INPUT/OUTPUT PROCEDURE | Both procedures combined with editing |
+| SR-N009 | Duplicate key SORT | Three records with same key (stability check) |
+| SR-N010 | Descending multi-key | DESCENDING + ASCENDING combined |
+
+## Key Techniques
+- SORT USING/GIVING
+- INPUT PROCEDURE / OUTPUT PROCEDURE
+- ASCENDING KEY / DESCENDING KEY
+- RELEASE statement (input procedure)
+- RETURN statement (output procedure)
+- Key break processing in output procedure