⚡ fix(sidecar): agent-runtime IO 批次——终态回写 O(N²) 消除/总线读增量化/后台恢复死路 (#411) - #457
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hasEvents 读全量只为看首行：改为定位读头部 64KB，头部无完整非空行时 回退全量判定，F4 分叉语义不变。GET_EVENTS 每次 afterSeq 增量轮询仍整文件 读+parse：ThreadState 记录字节水位（readOffset/maxSeqSeen），afterSeq 不早于 水位时只读新字节段；早于水位或 releaseThread 后回退全量，任意 afterSeq 语义保持。毒行截断与残尾处理与 readFile 严格一致。
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三项修复（#411）
① settleToolCall 每 tool_result 全量重写 → append-only 侧车行
run-state-store.ts:settleToolCall不再整文件 JSON.parse+重写（长 run 下 O(N²) IO），改为追加一行tool_settled侧车记录（O(1)）projectSettledItems物化终态回 tool_call 行；无侧车行时零分配快路compactModelStreamItems（finalize）一次重写完成 model_stream 裁剪 + 侧车物化，文件回归纯净形态countItems排除侧车行；孤儿侧车行（目标 tool_call 不存在）投影时静默丢弃，与原语义一致② 事件总线读路径全量扫描 → 头部判定 + 字节水位增量读
hasEvents：定位读头部 64KB 判首条非空行；头部无定论回退全量，F4 分叉截断语义严格一致read(afterSeq)：ThreadState 记录readOffset/maxSeqSeen字节水位，afterSeq 不早于水位时只读新字节段（openSync/readSync 定位读）；早于水位或 releaseThread 后回退全量——任意 afterSeq 语义不变③ waiting_background checkpoint 崩溃恢复死路
waiting_background；恢复横幅出现但 RESUME_RUN 命中 no-op 分支，文案声称"已重新附着"实际无任何动作LumeResumeService注入可选resolveBackgroundNotification（rpc 组装点从 transcript 取 background-process-recovery 落盘的终态通知）：有通知则与 live handleAsyncEvent 同形转换（ready_to_resume + syntheticToolResult）真正续跑；无通知则任务可能仍活着（durable 跨重启），如实返回等待态验证
bun run typecheck6 包全绿Closes #411