F11: PRE_SEED_TTL_SECONDS 45->120 (= client REINDEX_POLL_CAP_MS). At concurrency
1 a queued reindex can wait past the old 45s; if the pre-seed expired while
pending, getMasked fell back to the COUNT and reported done, so the client
stopped polling and missed the climb. Tie the pre-seed TTL to the client cap.
F12: extend the lockstep integration spec — insertPage takes content; a
text_content=null + text-node-content page is IN and a math-only page is OUT,
pinning the structural "type":"text" clause (and the jsonb space-after-colon).
F13: list all three embeddable clauses in the reindex JSDoc/inline comments.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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