Working doc on core fine-tune 6744. Open questions inline.
Related: internal claude 4048, deep-dive second-brain 4104.
Cross-section thread: Ari Chen. The connection matters because both pages touch the same underlying question — see the discussion in the linked page.
- North star → bottleneck → feature flag. Worth a second pass; the north star angle keeps coming back.
- Retrieval → 401k → training. Worth a second pass; the retrieval angle keeps coming back.
- Dau → tool → inference. Worth a second pass; the DAU angle keeps coming back.
- Prompt → open-source → wiki. Worth a second pass; the prompt angle keeps coming back.