Periodic task scheduler for Workshop agents.

Runs agent prompts on a recurring interval. Each schedule is a GenServer that calls cast/2 on each tick.

Usage from IEx

import AgentWorkshop.Workshop

every(:monitor, "Check CI status", interval: :timer.minutes(5))
schedules()          # list active schedules
cancel(:monitor)     # stop a schedule

Behavior

• Each tick calls cast(name, prompt) (non-blocking)
• If the agent is busy (cast queued), the tick is skipped
• Schedules survive agent resets but not Workshop restarts
• PubSub event {:schedule, :tick, name} on each run