docs: 锁定具身智能边缘采集网关方向 + 执行里程碑

[NeverENG]

锁定 docs/edge-positioning-feasibility.md 的产品方向并补充可执行里程碑（在 #121 已合并的分析之上）。

• 产品身份锁定：具身智能/AIoT「可编程边缘采集缓冲网关」——落盘前可编程预处理 + 边缘查询只上传命中切片，不替代 ROS2/MCAP/Zenoh。
• 三大能力映射到现有真代码：LSM 高频落盘 / PreHandle 真钩子 / scan+谓词边缘查询。
• Raft 诚实归宿：固定多节点复制采集清单/断点元数据（强一致刚需），不复制传感器流、不做移动 Multi-Raft 互备。
• 不做/不 claim 清单 + M1~M4 执行里程碑（先 benchmark 验地基）。

仅文档更新。

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[github-actions]

🐯 BanGD 数据库内核评审

整体风险：🟢 低

变更总结：PR 仅修改 docs/edge-positioning-feasibility.md，为已锁定的产品方向「具身智能边缘采集网关」补充了可执行的路线图里程碑（M1–M4）。改动未触及任何 .go 源文件、数据结构定义、编译产物或运行时行为——这是纯文档变更，对 BanDB 引擎的并发模型、内存所有权、锁协议、存储格式、WAL 崩溃安全、Schema 迁移等核心不变量零影响。

本评审不阻塞合入；架构级建议以 Issue 形式跟踪，普通问题在下方内联列出。

未发现需要从架构层面改进的问题。

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_{本次评审消耗 token：共 19111 tokens（输入 18878，输出 233，缓存命中 0，缓存写入 0）｜维度 [concurrency, memory, lock, storage, schema]｜对抗式复核 3 票/条，过滤疑似误报 0 条}