V3 flagship site redesign

Details

v3 becomes the flagship at /, v2 moves to /v2/, v1 stays at /v1/, with cross-version switching between all three. Research-informed feature set (hero + proof bar, NeuroSymbolic explainer, Supabase-rendered publications, projects gallery, stats, news, command palette, tooltips, cursor glint, Dark Reader opt-out), reviewed to ship consensus by multi-agent panels.

Files changed

Integration (merge) commit — no direct file changes.