What's Changed

• feat(genkit-tools/mcp): Add README for Genkit MCP Server by @ssbushi in #3892
• feat(genkit-tools/mcp): Add genkit:init command with support for runtime tools by @ssbushi in #3891
• feat(js): durable streaming for flows (experimental) by @pavelgj in #3770
• fix(js/ai/generate): Allow for model to be optional by @ssbushi in #3912
• chore(js/plugins): Deprecate the googleAI and vertexAI plugins... by @ifielker in #3916
• feat(js/plugins/google-cloud): implemented model armor middleware by @pavelgj in #3904
• feat(js/ai): added support for model middleware that can manipulate the stream and context by @pavelgj in #3903

Full Changelog: v1.25.0...v1.26.0-rc.0