normalize biome config (lineWidth 80, quoteStyle double), switch server to bun native, add CLAUDE.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deploy.sh

@@ -11,6 +11,9 @@ bun install
 echo "==> Building client (Vite)..."
 bun run build
 
+echo "==> Stamping service worker version..."
+sed -i '' "s/__SW_VERSION__/$(date +%s)/" dist/client/sw.js
+
 echo "==> Syncing static files to ${REMOTE_HOST}:${REMOTE_STATIC_DIR} ..."
 rsync -avz --delete \
 	--exclude='.DS_Store' \