test: 真实文件切片 fixture（#34 遗留项）#38
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- dd 自实际 vipdoc 切 3 条/文件：sz000001（1991 年首批日线）、 sh688001（科创板第一股上市首日）、sz000001.lc5（2025-01） - 断言为真实观测值（历史数据不变化，天然稳定）；float32 字段用 approx 容差 - 防合成 fixture 与解析器共享同一格式误解——本次真实字节验证 三条解析路径结论与合成 fixture 一致 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
用真实 vipdoc 文件切片补齐 issue #34 计划中的真实字节样本，与合成 fixture 互补（真实字节防"生成器与解析器共享同一格式误解"）。
What Changed
tests/fixtures/real_*.{day,lc5}：dd bs=32 count=3 切自实际数据盘（2026-07-07），每文件 96 字节How to Test
pytest tests/test_reader.py -v（10 passed；全量 55 passed）Risks / Tradeoffs
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