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Add a WordPress function replacement. Full workflow from WP source to Rust implementation, testing, and registration.

Benchmark a change to prove it is faster. Runs Criterion and PHP benchmarks before and after, compares results, and rejects regressions.

Debug when a Rust implementation produces different output than the WordPress fixture. Identifies the exact behavioral difference and fixes it.

Profile WordPress to identify functions suitable for Rust replacement.

Build the extension for PHP 8.3, install in the WordPress profiling stack, and verify it works end-to-end.