feat(electrobun): auto-updater + E2E tests + splash screen — ALL GAPS CLOSED

Auto-updater:
- updater.ts: GitHub Releases API check, semver comparison, timestamp tracking
- AdvancedSettings wired to real updater.check/getVersion RPC

E2E testing (45 tests):
- wdio.conf.js: WebDriverIO config for Electrobun (port 9761)
- fixtures.ts: isolated temp dirs, demo data, git repo init
- 4 spec files: smoke (13), settings (13), terminal (10), agent (9)

Splash screen:
- SplashScreen.svelte: animated gradient AGOR logo, version, loading dots
- App.svelte: shows splash until all init promises resolve, 300ms fade-out

ui-electrobun/package.json

@@ -8,7 +8,8 @@
 		"dev": "electrobun dev --watch",
 		"dev:hmr": "concurrently \"bun run hmr\" \"bun run start\"",
 		"hmr": "vite --port 9760",
-		"build:canary": "vite build && electrobun build --env=canary"
+		"build:canary": "vite build && electrobun build --env=canary",
+		"test:e2e": "wdio run tests/e2e/wdio.conf.js"
 	},
 	"dependencies": {
 		"@codemirror/autocomplete": "^6.20.1",