Memory graph visualization for dashboard #363
Description
Context
Follow-up from #277 (session-memory-visibility). The dashboard currently shows memory as flat lists.
Goal
Add an advanced memory timeline and relationship explorer to the dashboard for operators to visualize how memory entries relate across sessions and categories.
Scope
- Memory timeline view (entries over time, grouped by session)
- Category distribution chart
- Session-to-memory relationship explorer
- Optional: D3.js or similar for interactive visualization
Acceptance Criteria
- Dashboard has a memory visualization page/tab
- Timeline shows memory entries chronologically
- Category breakdown is visually represented
- Session relationships are navigable