Upgrade Claim 5 with audited Qwen2.5-3B MMLU evidence

Upgrade weak claim pages from stronger peer evidence with attribution

Expose five anchored fine-tuning and ICL claims

Update logbook: Repro - Fine-Tuning Without Forgetting In-Context Learning: A Theoretical Analysis of Linear Attention Models

Update logbook: Repro - Fine-Tuning Without Forgetting In-Context Learning: A Theoretical Analysis of Linear Attention Models