[Chore] Use exact package versions, update shared configs"

[venables]

• Use exact package versioning
• Add AGENTS.md, source it from CLAUDE.md
• Update tests to use assertive language
• Add @prettier/plugin-oxc, import sorting
• Enable prettier trailing commas
• Move shared dev dependencies to root

[coderabbitai]

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch venables/exact-versions

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