ZealPHP v0.4.10 - $wpdb-null functional concurrency race RESOLVED (consumed via ext-zealphp 0.3.56 Phase R): deep-frame global CV convergence; WP prepare()-on-null 160->0. - #438: RedisSessionHandler per-coroutine \Redis FD leak fixed via Coroutine::defer close (no more maxclients exhaustion). - Patched-opcache coroutine-legacy recipe complete (ZEALPHP_PATCH_OPCACHE: enable_cli + dups_fix + validate_timestamps=0) — unmodified WordPress leak-free under coroutine-legacy. - USE_ZEND_ALLOC=0 reframed as a non-fix (canonical doc); production fix is max_request recycle. - Guru issue wave (#432 + siblings, #435) folded in.