fix: add build:all script - packages must build in dependency order

Root cause of all web UI bugs: web-ui depends on jae-ai and jae-agent-core
being compiled first. Without their dist/ output, all tool imports
(bash, browser, web-search, voice-tts, memory) silently fail,
causing the entire app to crash at load time.

New scripts:
- build:all: builds packages in correct order
- build:example: builds all + example app
- dev:example: builds all + starts dev server

package.json

@@ -30,7 +30,10 @@
     "release:patch": "node scripts/release.mjs patch",
     "release:minor": "node scripts/release.mjs minor",
     "release:major": "node scripts/release.mjs major",
-		"prepare": "husky"
+    "prepare": "husky",
+    "build:all": "npm run build -w packages/ai && npm run build -w packages/tui && npm run build -w packages/agent && npm run build -w packages/web-ui",
+    "build:example": "npm run build:all && cd packages/web-ui/example && npm run build",
+    "dev:example": "npm run build:all && cd packages/web-ui/example && npm run dev"
   },
   "devDependencies": {
     "@biomejs/biome": "2.3.5",