- Add VISITOR module with localStorage-based visit tracking (anonymous,
no PII stored — just visit count and timestamps)
- Live visitor count via BroadcastChannel API, counting all open tabs/
windows sharing the Nexus; degrades gracefully if API unavailable
- Contextual Timmy greeting on enter: first visit, returning (2-4),
and frequent visitor (5+) all get distinct messages
- HUD badge (top-right) shows pulsing dot + live "N PRESENT" count
- Remove hardcoded static greeting from HTML; greeting is now injected
dynamically at enter time based on visit history