board: E-OCR-PARALLEL-1 — page-chunk rayon 3.34× on 4 cores, byte-identical to serial

[AdaWorldAPI]

What

Board-only companion to tesseract-rs' page-chunk parallel OCR PR: prepends E-OCR-PARALLEL-1 to .claude/board/EPIPHANIES.md.

Records the operator-pinned parallelization topology (page-chunk jobs Job=(doc_id,page_no), not whole-doc lanes, not a global crop pool; sort_by reassembly), the two enforced invariants (no nested parallelism — outer rayon owns CPU parallelism, inner forward single-threaded by design, &OcrPipeline proven Sync; determinism byte-identical to serial, gated by test + self-check), the measured near-linear scaling (1/2/4 threads → 0.99/1.94/3.34×, 84% efficiency), and the ruling that Morton/2-bit/cascade are search/codec superpowers (CAM-PQ/palette) that do NOT apply to the dense int8 forward — whose only lawful levers are parallelism (this) + SoA-batched tile-fill (gridlake, probe-gated).

🤖 Generated with Claude Code

https://claude.ai/code/session_016b33swuXE23hKtqxsHu9p1

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Reviewing files that changed from the base of the PR and between ae4264f and 0908be9.

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• .claude/board/EPIPHANIES.md

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