host
910168126d
perf: 桥变化才写、stdin 优先、stream 50ms 轮询
1. 桥写放大：旧代码每 ~50ms 轮询都无条件重写 state 和帧
文件（约 40 次原子 temp+replace/s 走 runsc gofer，
泵持久返回同一帧、updated_at 每轮都变，字节其实不变）。
现帧字节不变不写；state 只在 url/title/started/holder/
streaming 变化时写，或 0.5s 心跳一次（判死阈值 30s，
绰绰有余）；静态页写量从 ~40次/s 降到 ~2次/s。
2. MCP 主循环 stdin 优先：旧循环先 drain 再读 stdin，
每次工具调用都先付一轮文件 IO。现 pending 请求先处理，
空闲轮询 drain，忙时 200ms 保底 drain 一次防饿死。
3. stream 轮询 200ms → 50ms，画面延迟下限随之下降。
附回归测试：无变化轮询不重写、帧变化立即写、holder
变化绕过节流立即写。
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