Morning briefing created at vault/book/notes/morning-briefing-2026-02-05.md.

Summary of findings:

• No unchecked evidence gaps to search. Chapter 5 is the only chapter with an argument file, and all gaps were filled on 2026-02-01. No drafting has happened since, so no new gaps have emerged.
• 74 extracts in the vault across 7 sources. No new sources processed since 2026-02-01.
• Chapter 5 is ready to draft — this is the third consecutive briefing recommending it. The /draft skill and the narrative structure in extract-synthesis.md are ready to use.
• Research is blocked on extraction until either (a) drafting Chapter 5 surfaces new gaps, or (b) argument files are created for other chapters (6, 7, etc.) using /phd-adviser.