Add corrected checksums.txt

Update docs: corrected checksums, rebuild script, token-layout notes

Rebuild with corrected token layout: added tokens at 50358-50388, task tokens 50389-50395, timestamps 50396-51895; embedding rows permuted to match. Fixes Russian LID, translate, French/Spanish recognition.

Rebuild with corrected token layout: added tokens at 50358-50388, task tokens 50389-50395, timestamps 50396-51895; embedding rows permuted to match. Fixes Russian LID, translate, French/Spanish recognition.

Update README.md

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initial commit