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feat: DSG042 TUI 输入泵 stdin 原始流迁移 P1+P2（双通道开关渐进） - #465
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…KeyPump 收编现役+RawStdinPump 后台读线程全链,--raw-input 灰度开关,P3 实测后切默认退役 TryCollectPaste 状态机)而非裸切 | 原因: ReadKey 与原始流互斥全有或全无,现役 14 键位接线稳定不允许直切;KeyPressParser 解析器已完备仅缺生产接线 | 替代方案: 裸切原始流(无回退,Windows conhost 行为未实测);永久双轨(维护两套输入语义漂移)——均弃
P1 抽象收编（零语义变化）： - IInputPump 接口（Drain(dispatch) 非阻塞排空 — KeyPress 形态两通道一致，分派链零改动） - ReadKeyPump：现役 DrainInput 逻辑整体搬入（ReadKey 归一 + bracketed paste 重组状态机 + 误撞塞回缓冲） - ReplShell 消费 _inputPump.Drain（构造注入默认 ReadKeyPump）；五方法与 _pendingKeys 字段迁出 P2 RawStdinPump（完整 VT 链）： - 后台读线程（IsBackground）阻塞读 Console.OpenStandardInput → UTF-8 增量解码（跨块多字节保留）→ KeyPressParser 逐键解析（不完整前缀攒齐；paste 整块直出 — 重组状态机天然不需要）→ 有界通道 256 - 线程模型：_gate 锁保护 pending+投递（读线程解析/Drain 续投双向触发）；投递纯非阻塞（TryWrite 满即停 + span 回退防丢键）全链零同步等待 — 根除同线程 Feed+Drain 自死锁 - Drain 两轮续投（通道腾空后 pending 残留续投，至多两轮防活锁）；EOF 不关通道（EOF 不等于 Dispose） - FeedForTest 注入面（解码/解析/通道/Drain 全链可测；真实 stdin 阻塞行为留宿主 exe 验收 ADR 0080） 用户点报的自死锁根因与修复： - 自死锁链：FeedForTest 同线程同步投递 + WriteAsync.GetAwaiter().GetResult() 满等待 + 消费者 Drain 在同线程后续 — 互等永不退出 - 修复：投递非阻塞化（TryWrite 失败回退 span 本键起点不消耗）+ DropWrite 改 Wait（DropWrite 满时静默吞键返回 true 与满即停语义相反 — 300 键收 256 丢 44 实证）+ 测试收集循环 2s 超时熔断（fail-fast 带诊断：已收数/pending 残留 — 两处真 bug 均由熔断诊断定位） 验证: RawStdinPumpTests 13/13（含三倍容量键风暴压力 + 熔断）；全量 1721 四连全绿；Host 编译零警告
… Dispose(通道完成+取消;阻塞读由 IsBackground 进程退出回收不等待防挂)+重定向守卫沿用交互模式; 默认通道不变(ReadKeyPump 现役,--raw-input 显式灰度) | 验证: Host 编译零警告+selftest 冒烟过+RawStdinPumpTests 13/13
…节流走真实 stdin(终端本质即往 stdin 写这些字节,可信实测替代且可进 CI); 收敛=读线程退出(EOF 后半截序列残留 pending 属解析器正确语义不阻塞); 5s 超时熔断 fail-fast 带诊断(已收键数/pending); PendingCount 升 public 供探针消费 | 验证: 全表 OK(含 Ctrl+LeftArrow 修饰组合-ReadKey通道不可得形态/UTF-8中文多字节/paste整块)+半截paste与空输入快速FAIL非死等三场景
…节流走真实 stdin(终端本质即往 stdin 写这些字节,可信实测替代且可进 CI); 收敛=读线程退出(EOF 后半截序列残留 pending 属解析器正确语义不阻塞); 5s 超时熔断 fail-fast 带诊断(已收键数/pending); PendingCount 升 public 供探针消费 | 验证: 全表 OK(含 Ctrl+LeftArrow 修饰组合-ReadKey通道不可得形态/UTF-8中文多字节/paste整块)+半截paste与空输入快速FAIL非死等三场景
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Summary
--raw-input宿主灰度开关（默认 ReadKeyPump 不变；Dispose 生命周期收尾）--selftest-input探针：管道喂 VT 字节流走真实 stdin 路径（修饰组合/UTF-8 中文/paste 整块全表断言 + 5s 熔断；半截/空输入快速 FAIL）Test plan
printf 'ab\x15\x1b[D\x1b[1;5D\x1b[200~中文粘贴内容\x1b[201~\x1f你\r' | exe --selftest-input→ OK