~x-ai/grok-latest → A (4:1)

Commit A replaces an unreliable ~1800-line keystroke graph parser (plus parser_action, race-prone JS, Playwright race test, and render paths) with a small correct paste-and-go URL parser and redirect, permanently cutting complexity while preserving the real job (open a subreddit rank scope). Commit B is a solid but narrower fix: centralize base URL via HOSTNAME/window.location.origin and point Fly deploys at staging—useful ops/correctness, not a comparable design win.