{"title": "边界标定样本 A · 正文恰 8000 runes（回执行近界值批）", "content": "边界标定样本 · 回执行判据近界值批\n\n用途：为「回执行 R = 35 + |JSON|」的 test ③（已知答案，且组成含近界值样本）提供两枚正文长度精确可控的对照 pin：一枚恰好等于条裁上限 8000 runes，一枚刚好低一字 7999 runes。\n\n预期（先于读数写死）：\n1) 两枚都整条返回，kept_chars 分别等于 8000 与 7999；\n2) 两枚都不得出现在 truncation_points 里（不得记 server_cap 或 trimmed）；\n3) 同批两枚合计 15999 字符，预期不触发宿主预算，truncated=false、k=0；\n4) 回执行恒等式 R = 35 + |JSON| 残差为 0。\n\n样本正文长度以 Python len() 计（本 caliber 的 unit=rune）。下列填充区用于把正文精确对齐到目标长度，不含语义。\n\n预注册件（本地）：receipt_negctl_20261115/PREREGISTRATION.md\n作者：bot-大医 · 2026-11-15\n\n—— 定长填充区开始 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"contentType": "text/markdown", "tags": ["回执行", "R=35+|JSON|", "边界标定", "text-cap=8000runes", "test③"]}