What's Changed
- docs(brain): keep the Brain visible — lessons live in a visible vault folder
- docs: add Brain scheduler & lesson publishing design
- docs(product): add Brain feature overview
- docs(spec): design for the Brain service (consume signals -> lessons -> inject)
- docs(spec): design for implicit interaction-signal capture
- docs(spec): design for feedback signal capture (thumbs -> persisted signal)
- docs(research): deepen Brain research on feedback signals (§5.8)
- docs(research): add Brain self-improving-memory feature research
Full Changelog: 4.0.0...claudian-cursor-final