feat(sdk): AI SDK chat transport — run useChat as tasks #4915

Job	Run time
sdk-compat / Cloudflare Workers	29s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	49s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	19s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	38s
sdk-compat / Node.js 22.12 (ubuntu-latest)	22s
sdk-compat / Node.js 20.20 (ubuntu-latest)	30s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	18s
typecheck / typecheck	16s
sdk-compat / Bun Runtime	21s
sdk-compat / Deno Runtime	24s
units / packages / 🧪 Unit Tests: Packages (1, 1)	39s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	41s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	39s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	38s
units / internal / 🧪 Unit Tests: Internal (4, 8)	46s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	46s
units / internal / 🧪 Unit Tests: Internal (2, 8)	36s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	50s
units / internal / 🧪 Unit Tests: Internal (3, 8)	37s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	42s
units / internal / 🧪 Unit Tests: Internal (8, 8)	46s
units / internal / 🧪 Unit Tests: Internal (7, 8)	35s
units / internal / 🧪 Unit Tests: Internal (5, 8)	38s
units / internal / 🧪 Unit Tests: Internal (6, 8)	44s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	48s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	38s
units / internal / 🧪 Unit Tests: Internal (1, 8)	50s
units / packages / 📊 Merge Reports	16s
units / webapp / 📊 Merge Reports	2m 53s
units / internal / 📊 Merge Reports	24s
	19m 52s

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