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The server only checked the captcha when auth_key was absent — but
every real client (browser included, via the password split) sends
auth_key, so the check was off for everyone, and a bot skipped it by
including the field. The Register form still made humans solve a
widget whose token was never transmitted.
Gate is now unconditional on captcha.enabled. The web client
(registerUser in keyderive.js) forwards captcha.token; RegisterPage
resets the (single-use) token on a failed attempt. The desktop client
shares this UI source and is Chromium, so it renders the same widget
(see the paired meshbay-client commit for the CSP change that allows
it).
Tests: test_register_captcha.py.
Third security review, finding M1 (Option A).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011pG75yGK3NthNfyjH74omG
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