suzmii
81c2389132
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修复 AGC Direct 写通道项目锁零等待与持锁方不可诊断
- Direct 写路径（agc_write_file）改用统一的有界等待，与 file.write / file.patch / file.delete 同语义，同一轮并行写多个文件按同一把锁串行，不再在 24-42ms 内把重叠判成"项目正在被其他写操作占用"
- create_new 失败拆成争用 / 权限拒绝 / 其它三类：锁文件不存在却仍创建失败不再投影成争用；sharing violation(32) 与 lock violation(33) 恒定归争用
- 争用错误与等待日志带上持锁方身份（commandId / pid / createdAt / ownerIsSelf），锁文件处于删除挂起或未写完时显式表达成"身份不可读"
- ProjectWriteLockSnapshot 补 commandId 与 describe_holder()，沿用既有快照 + 字节 CAS 回收机制，不新增第二套回收判据
- 有界等待预算耗尽记 project.write_lock.wait_exhausted（含等待毫秒数），权限拒绝记 project.write_lock.permission_denied，争用不在零等待入口里逐次记账
- 新增同进程重叠写等待、同轮并行写、活外部进程持锁带身份、权限拒绝分类、ACL 拒绝不投影成争用五条回归用例
- 同步 decision-log、pitfalls 与技术方案文档
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