## What does this PR do?
This PR adds https://vercel.com/blog/introducing-react-best-practices for your coding agent using `npx add-skill vercel-labs/agent-skills` command
The skills are added to `.claude/`, `.cursor/`, and `.opencode/` directories to provide React and Next.js performance optimization guidance for AI-assisted workflows.
## Updates since last revision
Addressed Cubic AI review feedback for issues with confidence >= 9/10:
- **rerender-dependencies.md** - Replaced `console.log(user.id)` with `fetchUserDetails(user.id)` to avoid logging sensitive information
- **server-after-nonblocking.md** - Removed `sessionCookie` from `logUserAction` call to avoid logging sensitive authentication data, added `await` to async call
- **bundle-conditional.md** - Added `loadError` state and `setLoadError` setter to fix undefined `setEnabled` reference
- **advanced-event-handler-refs.md** - Updated `useWindowEvent` handler signature to accept `Event` parameter and forward it to the stored handler
- **rerender-derived-state.md** - Closed `<nav>` elements in both examples for valid JSX
Fixes applied to both `.claude` and `.cursor` skill directories for consistency.
## Mandatory Tasks (DO NOT REMOVE)
- [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
- [x] N/A I have updated the developer docs in /docs if this PR makes changes that would require a [documentation change](https://cal.com/docs). If N/A, write N/A here and check the checkbox.
- [x] N/A, I confirm automated tests are in place that prove my fix is effective or that my feature works.
## How should this be tested?
These are documentation files for AI coding agents. No runtime testing required - review the markdown files to verify the example code snippets are correct.
## Checklist for human review
- [ ] Verify example code snippets in the skill files are syntactically correct
- [ ] Confirm the fixes don't introduce new issues in the documentation examples
- [ ] Check that `.claude` and `.cursor` directories have consistent content
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Link to Devin run: https://app.devin.ai/sessions/f7f7e67fdeea4b22a4817d63ed9e1759
Requested by: unknown ()
Udit Takkar
7a9fdd5a0c