Stage-2: ROUGE-L 0.931, 90% zero-filler — new best

Full FT v2: ROUGE-L 0.930, 55% exact — best model

Full FT + GRPO: ROUGE-L 0.916 — new record, +2.5 over 2B

Full FT: ROUGE-L 0.907 — new record, +1.6 over prompted 2B

GRPO R2: ROUGE-L 0.892 — exceeds prompted 2B

GRPO model: ROUGE-L 0.891 — matches prompted 2B

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