agents: Add important note about yarn

[patrickelectric]

Summary by Sourcery

Documentation:

• Add an explicit note in AGENTS documentation to always use yarn for frontend commands and avoid npx/npm or other alternatives.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Documents a new guideline requiring the use of yarn (not npx/npm/others) for frontend commands in the agents documentation to prevent inconsistent tooling usage.

File-Level Changes

Change	Details	Files
Clarified frontend tooling usage by adding a strong note to always use yarn for frontend commands.	Added an emphasized note under the frontend commands section stating that yarn must be used for all frontend commands Explicitly discouraged the use of npx, npm, or other tools for running frontend commands to avoid inconsistencies	AGENTS.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[Williangalvani]

I just realized we have lock files for both bun and yarn... we should probably pick one and stick with it.
That is not this PR's fault though 🤷‍♂️