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>
2026-06-25 09:53:21 +08:00
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+# PERFORM Loop Variations
+
+## Test Cases
+
+| Test ID | Description |
+|---------|-------------|
+| LP-N001 | PERFORM VARYING (counting loop 1 TO 10) |
+| LP-N002 | PERFORM UNTIL (condition loop) |
+| LP-N003 | PERFORM TIMES (fixed count) |
+| LP-N004 | PERFORM THRU paragraph range |
+| LP-N005 | Nested PERFORM 3 levels |
+| LP-N006 | EXIT PERFORM / EXIT PERFORM CYCLE |
+| LP-N007 | Zero iteration PERFORM test |
+| LP-A001 | Inline PERFORM (END-PERFORM) variation |
+
+## Features Covered
+- All PERFORM variants (VARYING, UNTIL, TIMES, THRU)
+- Inline PERFORM with END-PERFORM scope terminator
+- Nested loops at 3 levels (27 iterations)
+- Loop exit (EXIT PERFORM) and cycle skip (EXIT PERFORM CYCLE)
+- Zero-iteration boundary cases
+
+## Expected Results
+All 8 tests should display PASS.