Sample hCaptcha-like fixture

This page exists to dogfood inspect_visual_challenge / solve_visual_challenge against the hCaptcha fingerprint without ever calling hCaptcha's servers. The iframe below mimics hCaptcha's image-grid layout: same iframe title attribute pattern, same outer URL pattern, same internal DOM hooks (.prompt-text, .task-grid, .task, .button-submit). Everything else is static markup — no third-party network call, no real challenge.

Hidden textarea below — real hCaptcha writes the verification token here on success; our fixture writes a fake token after the Verify click so the solve tool can detect "passed".