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Fix v4 token-count arithmetic: v4 data build is 257.9M tok (fw 150.6M + dclm 107.3M), cumulative ~308M, ~30 tok/param, 8.4x shortfall โ not the previously stated ~393M/~444M/~43.1. Verified against models/ldt-10m-v4/train.log data-build lines.
d87c565 verified