docs: instructions for coding agents

[albinsuresh]

Proposed changes

• A coding agent agnostic AGENTS.md file with project specific instructions
• Dedicated CLAUDE.md file which just refers to AGENTS.md, since claude code doesn't respect AGENTS.md files (yet)
• Dedicated skills for commonly used tasks.

The content was generated by claude code itself.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s. You can activate automatic signing by running just prepare-dev once)
• I ran just format as mentioned in CODING_GUIDELINES
• I used just check as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[codecov]

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✅ All modified and coverable lines are covered by tests.

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[reubenmiller]

Approved. We can always iterate on this after we've used it more