PixivClient mirrors gallery-dl 1.32.5's PixivAppAPI request profile exactly
(iOS app headers, OAuth refresh with X-Client-Time/X-Client-Hash,
/v1/user/illusts pagination via next_url — whose query string doubles as the
resumable page cursor). Post-first seams (post_record_key / post_is_gated /
post_meta) + extract_media covering multi-page, single-page, ugoira zip
(600x600→1920x1080 swap, frame delays memoized for the post record), and
limit_* placeholder gating. No PHPSESSID web fallback: FC holds only the
refresh token, same effective coverage as the gallery-dl path.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM
bvandeusen
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