feat(vd-analysis): 归档 DLD154V4B 分析 (五型号对比总表)

- models/DLD154V4B/analysis.md: AT32F421 M4+FreeRTOS V2.8 — M1H 的现代实现
  关键发现: 混合节拍架构 (检测 10ms 主循环 CAP_OK 门控 + 时序状态机
  TMR15 50ms tick); 归一化基数 131072 是参考型号 32768 的 4 倍
  (测量窗 2.18ms 快 15x, 精度高 4x); 无看门狗; 平坦性三条件离开
  (CN200910309382); V2.8 最高档 10→20 (广告杆落杆误触发)
- README/cross-model-comparison: 升级五型号, V4B 列含混合节拍/131072/32ms τ
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| PD132T | MA801AS / 8051 (Keil) | V3.01 (2021-06) | [models/PD132T/analysis.md](models/PD132T/analysis.md) | `reference/PD132T_V3.01-20210623` |
| M1H | STC12C5202 (8051) | V1.00 (2008-12) | [models/M1H/analysis.md](models/M1H/analysis.md) | `reference/M1H code` |
| TLD-110 | P87LPC762 (8051, 汇编) | V2.33 (2006-07) | [models/TLD-110/analysis.md](models/TLD-110/analysis.md) | `reference/TLD-110(410) code` |
| DLD154V4B | AT32F421 (M4, FreeRTOS) | V2.8 (2026) | [models/DLD154V4B/analysis.md](models/DLD154V4B/analysis.md) | `vd_detector/DLD154V4B`(自研) |
## 目录结构