Add game UI panels, keyboard shortcuts, docs narrative overhaul, and unified dev script

- Add MiniStarMap, NpcMarketPanel, ShipStatusPanel, useKeyboardShortcuts
- Add progress bars for approach/mining operations and cargo fill indicator
- Rewrite docs from spreadsheet-first to exploration-first open-world RPG
- Replace dev:db + dev:standalone with unified dev script (scripts/dev.sh)
- Add Vite chunk splitting for three.js and spacetimedb
- Fix displayName dependency in useSpacetimeConnection
- Remove stale usePlayerSession.ts
- Add AGENTS.md files across all packages

apps/site/AGENTS.md

@@ -0,0 +1,20 @@
+# apps/site — Public Landing Page
+
+Package: `@void-nav/site`
+Port: `http://localhost:5174`
+
+Minimal marketing/landing page for VOID::NAV. Uses `@void-nav/ui` for shared primitives.
+
+## Structure
+
+```
+src/
+  main.tsx         Entry point
+  pages/
+    LandingPage.tsx    Landing page with hero section and links to game + docs
+    NotFoundPage.tsx   404 page
+  styles/
+    tailwind.css       Tailwind v4 entry point
+```
+
+This is the simplest app in the monorepo. It exists to provide a public entry point that links to the game and docs.