feat(sdk): AI SDK chat transport — run useChat as tasks #4711

Job	Run time
sdk-compat / Cloudflare Workers	37s
typecheck / typecheck	36s
sdk-compat / Bun Runtime	37s
sdk-compat / Node.js 22.12 (ubuntu-latest)	36s
sdk-compat / Node.js 20.20 (ubuntu-latest)	37s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	26s
sdk-compat / Deno Runtime	37s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	26s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	29s
units / packages / 🧪 Unit Tests: Packages (1, 1)	35s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	25s
units / internal / 🧪 Unit Tests: Internal (1, 8)	31s
units / internal / 🧪 Unit Tests: Internal (6, 8)	34s
units / internal / 🧪 Unit Tests: Internal (4, 8)	28s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	35s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	29s
units / internal / 🧪 Unit Tests: Internal (8, 8)	35s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	35s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	28s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	33s
units / internal / 🧪 Unit Tests: Internal (5, 8)	26s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	31s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	28s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	34s
units / internal / 🧪 Unit Tests: Internal (2, 8)	29s
units / internal / 🧪 Unit Tests: Internal (3, 8)	33s
units / internal / 🧪 Unit Tests: Internal (7, 8)	29s
units / webapp / 📊 Merge Reports	1s
units / packages / 📊 Merge Reports	1s
units / internal / 📊 Merge Reports	1s
	14m 22s

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