Why: The model A/B branch merged into main via #296 (the final item of the
quality improvement plan); its task card must be backfilled and archived to
prevent bookkeeping debt.
Evidence: SELF - merge 63a2485 verified via git log --merges against
origin/main; card backfilled with the PR link.
Impact: .task/feature-agent-model-ab.md moved to .task/archive/ with status
backfilled; no code or submodule change.
Refs: task.sh close semantics (replicated from a temp worktree because the
main checkout is occupied by a parallel writer's branch).
Blocking a user prevents them from interacting with repositories, such as opening or commenting on pull requests or issues. Learn more about blocking a user.
卡闭合：feature/agent-model-ab 已随 Dev #296 合入（merge 63a2485），回填主记录 PR 链接并归档。整个质量改进计划（P0–P5 + 模型 A/B）至此全部完成。Evidence: SELF - task-close 语义在临时 worktree 复刻（主检出被并行写者占用）；merge 经 git log --merges 对 origin/main 核验。