release 0.4.0 🎉

What's Changed

• Improve end to end tracing by @salmanap in #628
• fixed mixed inputs from openai v1/responses api by @salmanap in #632
• enable state management for v1/responses by @salmanap in #631
• orchestration integration by @nehcgs in #623
• Use mcp tools for filter chain by @adilhafeez in #621
• fixed reasoning failures by @salmanap in #634
• feat: redesign archgw -> plano + website in Next.js by @Spherrrical in #613
• include contact page and restructuring by @Spherrrical in #640
• plano orchestration using plano orchestration 4b model by @adilhafeez in #637
• Update docs and README to Plano by @salmanap in #639
• rename cli to plano by @adilhafeez in #647
• rename to planoai by @adilhafeez in #650

Full Changelog: 0.3.22...0.4.0