ux-assessment

Run the two-role, agent-driven UX walkthrough of the HexGraph web UI against the living contract in docs/dev/ux-contract.md. Use this on every major UI change, fix evaluation, or release: one agent (the VR analyst) drives HexGraph the way a researcher's agent would and populates every surface; a second, separate agent (the simulated researcher) opens the UI cold and walks the contract entry by entry, scoring each…