fix(react-best-practices): correct rule 5.4 - memo checks props not default parameter values

[jaryalarshita]

Closes #140

The original rule 5.4 incorrectly claimed that using a default non-primitive parameter (like onClick = () => {}) in a memo component breaks memoization when called without that prop.

This is inaccurate. memo() compares incoming props, not internal default values. When <UserAvatar /> is called without onClick, memo sees undefined === undefined and correctly skips the re-render.

The real issue occurs when the default value is used as a dependency in useEffect, useCallback, or useMemo — a new function instance is created on every render, causing those hooks to re-run unnecessarily.

Changes

• Corrected the description in rerender-memo-with-default-value.md and AGENTS.md
• Updated the bad/good examples to show the actual problematic scenario (hook dependency arrays, not memo prop comparison)

[vercel]

@jaryalarshita is attempting to deploy a commit to the Vercel Team on Vercel.

A member of the Team first needs to authorize it.