0.31.0

Offer to install agent skills during rngo init and add the rngo skills install command to install / update post initialization.

What's Changed

• Install skills during rngo init by @khyrngo in #23
• Add rngo agent skills install to CLI by @khyrngo in #24
• Simplify skill installation by @khyrngo in #25
• Move skills CLI namespace to top level by @khyrngo in #26

Full Changelog: 0.30.0...0.31.0
Blog: https://rngo.dev/blog/release-friday/agent-skills