Genkit JS 0.9.0-rc.1

What's Changed

• docs: genkit start is back by @kevinthecheung in #1233
• [JS][vertexai] Improves first request performance w/ specified project id by @mbleigh in #1237
• [Go] Replaced local trace store with telemetry server store. by @apascal07 in #1214
• docs: update guidance on genkit start command by @huangjeff5 in #1220
• chore: removed generate/generateStream from executable prompts by @pavelgj in #1239
• docs: preamble syntax by @kevinthecheung in #1235
• chore: made flows array required on startFlowServer by @pavelgj in #1241
• chore: build doc snippets along with everything by @pavelgj in #1240
• Add new endpoint to trpc for polling runtime status from dev ui by @MichaelDoyle in #1242
• fix(js/plugins/ollama): fix ollama embedding config by @cabljac in #1246
• feat: added -o/--open option to genkit start to pop up a browser by @pavelgj in #1247
• docs: update guidance on how to write a plugin by @huangjeff5 in #1218

Full Changelog: https://github.com/firebase/genkit/compare/@genkit-ai/core@0.9.0-rc.0...@genkit-ai/core@0.9.0-rc.1