feat: PLANNING体系首版（00路线图/02任务总表/03执行协议/I-03/I-04/registry42口径）+M1止血交付

2026-09-12 14:25:25 +08:00
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+新建 stats.py，含 mean/median，空列表均返回 0.0，偶数个取中间两数平均。
+自测块已真实运行：
+
+```
+$ python stats.py
+M-OK
+MD-OK
+all stats self-tests passed
+```