rexenv 0.8.7

rexenv now runs on macOS 13 and 14 (macOS 15 stays the standard). The app derives a binary tier from the host each launch: on 13/14 it uses older, measured pins (MySQL 8.4.3, MariaDB 12.0.2, Redis 8.2.1, Apache 2.4.65, cloudflared 2025.4.0, Xdebug 3.4.5) and says which macOS PostgreSQL and PHP 8.0 need; an in-place upgrade to 15 moves every engine to the current pins on the same data. Also: the DNS watchdog re-examines a resolver it had given up on, and never brings back one you removed from Settings; a typed bare name.rex opens in Firefox.