Scheduling & recurring tasks

The @elizaos/plugin-cron npm package and plugins/plugin-cron submodule are removed from this repository.

Scheduling and recurring work use the runtime TaskService (serviceType: "task", ServiceType.TASK in @elizaos/core) together with triggers and the dashboard/API surface around /api/triggers and TRIGGER_DISPATCH.

For product-facing docs on triggers and tasks, see Runtime → Services and Tasks / triggers sections in the main documentation.