The crawler's headless Chromium advertised the default HeadlessChrome UA,
which Cloudflare's bot detection challenges on sight — over Tor that meant an
unsolvable 'Just a moment' page on every fetch, so session verification kept
classifying pages as transient and the metadata pass failed at
'acquire browser lease'. (Confirmed empirically: same Tor exit + a normal
Chrome UA returns the real page with the #logo sentinel; the HeadlessChrome
UA returns the challenge.) The existing user_agent setting only fed reqwest,
never the browser. Override the launcher's UA with a realistic non-headless
default (CRAWLER_USER_AGENT to customize); the UA may contain spaces, unlike
CRAWLER_BROWSER_ARGS.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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