Expand April 8 - April 21 2024 entries to detailed bullet format

Rewrite paper rows for two more weekly entries in the 2025-era detailed style:
- April 15 - April 21 2024: Llama 3, Mixtral 8x22B, Chinchilla Scaling replication, How Faithful are RAG Models (ClashEval), RAG Survey, Illusion of State in SSMs, RAG for Structured Outputs, Emerging AI Agent Architectures, LM In-Context Recall is Prompt Dependent, SSM Survey.
- April 8 - April 14 2024: Infini-attention, OpenEQA, CodeGemma, LM-Guided Chain-of-Thought, Synthetic Data Best Practices, THOUGHTSCULPT, Multilingual LLMs Survey, Physics of Language Models (2-bits-per-parameter), Quote-Tuning, Influence Between NLP and Other Fields.

Each paper is fronted with a 1-2 sentence overview and followed by 4 themed bullets covering method, setup, concrete numerical results, and implications - matching the format used for 2025-2026 weekly entries.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>