Replace guessed phases with ground truth: harvest.sh seeds
logs/<source>.phase=采集中 and the prompt requires the agent to overwrite
it the moment it enters each stage (采集中/摘要生成/推送/收尾); trap deletes
it on exit. Panel reads the phase file first, falls back to factual disk
signals (registry/.summaries/.manifest mtimes), and shows neutral 运行中
when no signal exists — no more inference, no more (推定) labels.