Replace electron with Bun compile for single-file exe distribution

AGENTS.md

@@ -63,19 +63,23 @@ All scripts are in `package.json`.
 
 ## Distribution
 
-## Electron single-exe distribution
-To package as a single portable exe with built-in server:
+## Single-file exe distribution
+To build a standalone executable with embedded static files:
 ```bash
-cd web/electron
-npx electron-builder --win --x64
+cd web
+bun run build:exe
 ```
-Output: `web/electron/release/OpenChamber.exe` (single portable exe, ~260MB)
+Output: `web/OpenChamber.exe` (~320MB single file)
 
 The exe includes:
-- Bundled Node.js runtime
-- Server code, static files, and CLI
-- System tray icon with context menu
-- Auto-starts server on port 3000
+- Bun runtime
+- Server code and all dependencies
+- 300+ static files (dist/, embedded)
+- Extracts static files to temp directory on startup
+
+Files involved:
+- `web/entry-singlefile.js` - Entry point for compiled exe
+- `web/embed-static.js` - Script to embed dist/ as base64
 
 ## Runtime entry points
 - Web bootstrap: `web/src/main.tsx`