docs: sync README core stack version

README.md

@@ -18,7 +18,7 @@ Features a premium animated homepage (typewriter hero, floating orbs, scroll cou
 | Docker          | 24+          | Optional — for containerized deployment |
 | Valkey          | 8.x+         | Optional — caching, rate limiting, SSE  |
 
-Core stack: **Next.js 16.4.2** (App Router) · **React 19.3.1** · **TypeScript 7.0.2** · **Drizzle ORM 0.45.4** · **Zod 4.6.7** · **Vitest 5.0.5** · **Biome 2.5.15** · **Playwright 1.64.1**.
+Core stack: **Next.js 16.4.2** (App Router) · **React 19.3.1** · **TypeScript 7.0.2** · **Drizzle ORM 0.45.4** · **Zod 4.6.7** · **Vitest 5.0.5** · **Biome 2.6.2** · **Playwright 1.64.1**.
 
 > Builds must run through the `pnpm` scripts. This host has no swap and
 > `vm.overcommit_memory=0`, so an uncapped `next build` gets OOM-killed by the