feat: merge-train/barretenberg#22646
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Rewrites the Databus relation to avoid the need for `read_tags` (boolean witnesses indicating `read_counts` > 0) Previously the databus relation had the following inverse correctness subrelation: `(lookup_term * table_term * inverses - inverse_exists) * scaling_factor ` where `inverse_exists = is_read + read_tag - is_read * read_tag` This PR splits this into two subrelations, one for reads and one for writes: (1a): `(lookup_term * table_term * inverses - 1) * is_read` (1b): `(lookup_term * table_term * inverses - 1) * count` The lookup subrelation itself remains unchanged. This keeps the total number of subrelations at three but removes one witness poly per databus column.
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This was referenced Apr 18, 2026
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chore: update databus relation to remove need for read tags (#22610)
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