U[更新分支] 正常完成 50 次覆写，state_version 单调至 51
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m11b2c P99 实测探针
  write_event_with_state → pbl_runtime_ext.tx_write.apply_runtime_event
  read_entity_state      → pbl_runtime_ext.tx_read... read_states
采样次数=50（门禁下限 30）  事件表=104 行  状态表=54 行  快照表=0 行  hub游标=104
seq_no 单调性：PASS 严格递增
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write_event_with_state[INSERT分支] n=50   min=  0.1102 avg=  0.1475 p50=  0.1442 p90=  0.1739 p95=  0.1790 P99=  0.1827 max=  0.1827  (ms)  PASS(<=200ms)
read_entity_state              n=50   min=  0.0460 avg=  0.1148 p50=  0.1099 p90=  0.1713 p95=  0.1748 P99=  0.1776 max=  0.1776  (ms)  PASS(<=200ms)
write_event_with_state[UPDATE分支] n=50   min=  0.2318 avg=  0.2624 p50=  0.2575 p90=  0.2804 p95=  0.2828 P99=  0.4820 max=  0.4820  (ms)  PASS(<=200ms)
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read 行 entity_id 一致性校验：PASS 全部与请求一致
P99 门禁 SLA_P99_MS=200.0ms → write(INSERT) P99=0.1827ms / read P99=0.1776ms / write(UPDATE) P99=0.4820ms
P99 结论：达标（均 ≤ 200ms）
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