Context

This makes zed-agent prioritize rules files in the same order as is described in the docs. My order of experience was

• saw in my zed agent thread `Using project "CLAUDE.md" file.
• went to settings to see if I can make it use AGENTS.md instead.
• went to the docs where it specifies that AGENTS.md is be picked over CLAUDE.md.
• went to source to see what went wrong

How to Review

I'm changing the order of filenames in an array - the only two places where the order matters is when picking which rules file to use. The last place it's used with an .iter().any().

Self-Review Checklist

• I've reviewed my own diff for quality, security, and reliability
• Unsafe blocks (if any) have justifying comments
• The content is consistent with the UI/UX checklist
• Tests cover the new/changed behavior
  • If you want the behavior tested I can, but I think it's equally hard keeping docs and tests and docs and this codepath in sync.
• Performance impact has been considered and is acceptable

Release Notes:

• Fixed agent rules files are prioritized as described in docs