feat(sdk): AI SDK chat transport — run useChat as tasks #4725

Job	Run time
sdk-compat / Bun Runtime	1m 56s
typecheck / typecheck	6m 27s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	3m 38s
sdk-compat / Cloudflare Workers	2m 3s
sdk-compat / Node.js 20.20 (ubuntu-latest)	2m 1s
sdk-compat / Deno Runtime	1m 46s
sdk-compat / Node.js 22.12 (ubuntu-latest)	2m 4s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	3m 24s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 49s
units / packages / 🧪 Unit Tests: Packages (1, 1)	8m 3s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 50s
units / internal / 🧪 Unit Tests: Internal (6, 8)	4m 41s
units / internal / 🧪 Unit Tests: Internal (7, 8)	5m 34s
units / internal / 🧪 Unit Tests: Internal (5, 8)	4m 2s
units / internal / 🧪 Unit Tests: Internal (2, 8)	9m 16s
units / internal / 🧪 Unit Tests: Internal (1, 8)	6m 12s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	3m 36s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	5m 55s
units / internal / 🧪 Unit Tests: Internal (3, 8)	6m 24s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	5m 46s
units / internal / 🧪 Unit Tests: Internal (8, 8)	3m 10s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 2s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	2m 27s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	3m 45s
units / internal / 🧪 Unit Tests: Internal (4, 8)	5m 9s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	5m 9s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	8m 12s
units / packages / 📊 Merge Reports	16s
units / webapp / 📊 Merge Reports	39s
units / internal / 📊 Merge Reports	1s
	1h 58m 17s

Provide feedback