refactor(agents): extract schedules into agents/schedules

[mattzcarey]

Stack

• Depends on refactor(mcp): client manager hooks into standard AgentLifecycle #1895 (feat/standardise-agent-lifecycle).
• This is a separate draft and should not be merged before its base.

Summary

• Add an Agent-owned AgentScheduler component and publish it from agents/schedules.
• Move schedule schema migration, CRUD, retries, callback execution, observability, facet ownership, and cleanup out of the base Agent.
• Keep the single physical Durable Object alarm in Agent, where it is still arbitrated with destroy, keep-alive, fiber recovery, facet runs, and timers.
• Keep Agent.schedule, scheduleEvery, get/list, and cancellation methods as compatible delegators.
• Move natural-language scheduling helpers to agents/schedules; retain agents/schedule as a deprecated compatibility re-export.

Behavior preserved

• one-shot, cron, and interval semantics
• idempotent schedule creation
• callback retry and transient platform deferral
• alarm memory-limit circuit breaking
• stale duplicate warnings and hung interval recovery
• sub-agent owner paths and root alarm routing
• schema migration and explicit destroy cleanup

Scope

This does not extract queues, fibers, workflows, keep-alive, timers, or physical alarm arbitration.

Verification

• pnpm run build
• pnpm run check
• focused Workers suites: 302 tests across scheduling, migration, alarms, retries, keep-alive, destroy, and sub-agents
• lifecycle component tests: 9 tests
• CI=true pnpm exec nx affected -t test
  • Agents: 2,245 tests
  • AI Chat: 728 tests
  • Think: 974 tests across Workers/generated-entry/Vite/CLI/React suites
  • affected Voice, recovery, and example suites also passed

[changeset-bot]

🦋 Changeset detected

Latest commit: dc270cc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
agents	Minor
@cloudflare/agent-think	Patch

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commit: dc270cc