[kaifcodec]

• Resolved HTTP 403 bot-wall errors across 20 MediaWiki platforms by switching from generic_validate to impersonate_validate with Chrome TLS impersonation.
• Removed conflicting custom user-agent headers so curl_cffi can negotiate browser-consistent TLS fingerprints and request headers without triggering Cloudflare blocks.
• Verified both available and taken states live against confirmed accounts on each platform, extracting schema-compliant metadata (id, joined, edit_count, gender, groups).
• Retained explicit MediaWiki missing markers for availability to prevent false positives.
• Ensured all local CI gates pass: ruff, mypy (0 issues across 2,832 files), and 515 pytest suite tests.

Platforms covered:

• asg (community)
• aurodossa (community)
• auuversewiki (community)
• airlinesafetycards (creative)
• brockvillerailfan (creative)
• abysssmp (gaming)
• site_2001office (gaming)
• site_2b2tar (gaming)
• site_5jasmp (gaming)
• wiki_3c3u_info (gaming)
• aikarebirthfanfic (learning)
• akiraworldvisionsongcontest (music)
• amnhacvietnam (music)
• andonewiki (music)
• bumblekast (music)
• site_48plus_org (music)
• wiki_albrusmusic_ru (music)
• aciespco1921 (other)
• adiaproject (other)
• afterfortyninewiki (other)