feat(cursor): add support for rule anatomy fields

[ishandhanani]

This PR allows you to specify

[agents.cursor]
description = "RPC Service boilerplate"
globs = ["*.tsx", "*.rs"]
always_apply = false

which translates to

---
description: RPC Service boilerplate
globs: *.tsx, *.rs
alwaysApply: false
---

I added this because I usually want the setting of the cursor rule to be intelligent AI search vs "alwaysApply: true"

[ishandhanani]

Hi @intellectronica - thank you so much for such a great project. Let me know what you think about this PR.