- harvest.sh: global queue lock (runlocks/.queue, mkdir-atomic, stale-PID
  steal, 180min wait cap) — a source whose time arrives while another is
  harvesting now waits (phase 排队中) and auto-starts when the previous
  run exits; runlock is created before queueing so the panel shows queued
  sources; manual panel trigger no longer refused (it queues)
- bin/plan_schedules.py + schedule-plan.json: frequency-driven planner —
  deadline/safety/min-gap/day-window/avoid all configurable; morning slots
  laid backward from deadline-safety with exact gaps (wrapping to previous
  evening when the roster exceeds the night), freq>1 sources spread evenly
  across the day window, global gap resolution; --dry-run supported
- 调度中心: ⚙ 按计划重排全部排程 button (POST /schedule-plan-apply)
- applied: 12 sources — 3×4/day (wsj/ft/digitimes-feed latest morning
  slots) + 9×1/day, 40-min spacing, last start 05:30 vs 06:00 deadline