Dev Weekly Aug 3-9, 2026: Meta Ships Muse Code, GPT-5.6 Luna Becomes the Free ChatGPT Default, Qwen 3.8-Max Goes GA, Next.js 16.3, and a Black Hat GitHub-Issue RCE in Claude Code, Gemini CLI, and Codex

Meta's Muse Code terminal agent on Muse Spark 1.2, OpenAI's GPT-5.6 August retune with GPT-5.6 Luna as the free default, Alibaba's 2.4 trillion parameter Qwen 3.8-Max, Next.js 16.3 Instant Navigations, Claude Code auto mode going default, Kimi K3 landing in GitHub Copilot, a Black Hat supply chain security disclosure that turned public GitHub issues into remote code execution across AI coding…