acp-loop adds cron scheduling for AI agents

This is a small but useful piece of agent infrastructure: lots of AI coding tools can execute prompts, but very few give developers a clean way to run them on a schedule.

• –The hook is agent-agnosticism: instead of hardwiring one model vendor, acp-loop rides the ACP layer so the same scheduler can target multiple CLIs
• –The most practical use cases are ops-flavored workflows like deploy checks, issue triage, and periodic summaries rather than flashy autonomous-agent demos
• –Support for cron expressions, stop conditions, timeouts, and max iterations makes it feel more like real automation plumbing than a toy wrapper
• –The catch is that it depends on ACP/acpx setup and permission policy handling, so it is best suited to power users already experimenting with agentic developer tooling