JianFeeeee
a971fc8877
feat(scheduler): M5 饥饿防护（抢占计数提升有效级 + 抢占冷却）
设计依据 docs/zh/input-scheduler-design.md §9、§11.5（G1/G2）。
- Task 增加 PreemptCount / LastPreemptAt；effectiveLevel(t) =
min(L4, Level + min(PreemptCount, 2))：被抢占越多越“值钱”，
逐步追上抢占它的流，但封顶 L4 因而抢不过真正的紧急输入
- 选择函数 taskBefore 改用有效级；requestPreempt 与 preemptGrantedFor
同样以有效级比较
- 抢占冷却 preemptCooldown=2s：刚被抢占的任务期内不再被抢占，
避免同一任务被反复打断到永不完结
- 新增 scheduler_starvation_test.go 4 项：提升与封顶、冷却期内不得再抢占、
提升后同级不得抢占而更高可、选择函数确实用有效级
- 验收：agent 全量 + -race；全仓 build/vet 通过
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