Document the ASCII case folding requirement#95
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PHP's case-conversion functions honor
LC_CTYPEbefore PHP 8.2, and the ecosystem-wide sweep converting every call site to locale-independent ASCII folds (guzzle/psr7#851 and siblings) added a corresponding AGENTS.md rule to the packages it touched. This adds the same rule here preventively so future code follows it, mandating theGuzzleHttp\Psr7\Utilshelpers this package can already reach through its psr7 dependency.