Biome GritQL Custom Lint Rules

Create AST-based custom lint rules using Biome's GritQL plugin system.

Quick Start

Create a rule file (rules/no-use-effect-fetch.grit):

`useEffect($callback, $deps)` where {
    $callback <: contains `fetch`,
    register_diagnostic(
        span = $callback,
        message = "Don't fetch inside useEffect. Use TanStack Query instead.",
        severity = "error"
    )
}