Promote UCM2/HiFi (Jack-driven) as the primary delivery, add HISTORY.md, remove ProAudio/REPRO docs and non-UCM scripts, and fix repo-wide references. Made-with: Cursor
- 新增 OPERATION_PipeWire_Kaisa_ProAudio / UCM_HiFi，核心问题复盘与恢复 Ubuntu 重测手顺；HDMI 旧文改为 stub。 - 脚本：apply / verify-pro-audio、strip default-profile、reapply-session、remove deb 与 UCM overlay、verify-audio-environment。 - systemd-user：kaisa-pro-audio-reapply.service 示例。 - README、docs 索引、REPO_INDEX、REPRO deb 存档说明；deb 标为未来计划；reference/ucm2 与采集脚本小改。 - debian 与 _bmad-output 规划文件随本次工作区一并更新。 Made-with: Cursor
