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

packages/AGENTS.md

@@ -0,0 +1,9 @@
+# packages/ — Shared Libraries
+
+Shared packages consumed by one or more apps in the monorepo.
+
+| Package | Export | Used By |
+|---------|--------|---------|
+| `ui` | `@void-nav/ui` | `apps/game`, `apps/site` |
+
+All packages use TypeScript and export directly from source (no build step — consumers handle bundling).