scripts: add scripts/train_sft_completion_only.py

scripts: add scripts/gen_validator_sft_qwen72b.py

scripts: add scripts/gen_planner_preds_for_validator.py

scripts: add scripts/build_validator_paper_format.py

scripts: add scripts/build_orpo_data.py

scripts: add scripts/compute_bestofn_with_selector.py

scripts: add scripts/run_pipeline_rollouts.py

chore: remove stale scripts/build_validator_sft_v3_balanced.py

chore: remove stale scripts/build_validator_2agents_v3.py

chore: remove stale scripts/build_fixer_replanner_iter2.py

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