Second Brain / eBrain

Knowledge graph system for ESS operations. Local Obsidian vault → Quartz build → D3 force graph at eBrain.S-3.us. Eliminates re-derivation tax; auto-generates DAR entries via session hooks.

Spec: docs/superpowers/specs/2026-08-19-second-brain-design.md Plan (Phase 1): docs/superpowers/plans/2026-08-19-second-brain-phase1.md