Append 5,173 cleaned Lean source chunks from Vilin97/lean-pool@8996c19, leanprover-community/physlib@cf1d86d, and leanprover/cslib@4bec19f. Excludes challenges, active sorry/admit and dependent Physlib files, PhyslibAlpha, tests/scripts/root aggregators, and generated or numeric-heavy data. Adds 19.41M Qwen2.5-Coder tokens or 23.13M DeepSeek-Prover-V2 tokens.
