Declare seed-1234 subsample configs in data_files metadata

Add deterministic seed-1234 subsample-50 and subsample-100 configs

Remove 2 confirmed repetition row(s) from gemma-4-26b-a4b-it-think-gen-4096-vt280-subsample-500

Remove 1 confirmed repetition row(s) from qwen3.6-35b-a3b-think-gen-4096-subsample-500

Remove 3 confirmed repetition row(s) from qwen3.5-4b-think-gen-4096-subsample-500

Remove 1 confirmed repetition row(s) from qwen3.6-35b-a3b-ins-gen-2048-subsample-500

Remove 2 confirmed repetition row(s) from qwen3.5-4b-ins-gen-2048-subsample-500

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