feat(sdk): chat.agent — runtime + browser transport (2/4) #5833

Job	Run time
typecheck / typecheck	34s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	50s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	19s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	47s
sdk-compat / Node.js 22.12 (ubuntu-latest)	31s
sdk-compat / Deno Runtime	34s
sdk-compat / Cloudflare Workers	40s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	19s
sdk-compat / Bun Runtime	34s
sdk-compat / Node.js 20.20 (ubuntu-latest)	31s
units / e2e-webapp / 🧪 E2E Tests: Webapp	44s
units / packages / 🧪 Unit Tests: Packages (1, 1)	53s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	1m 1s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	53s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	1m 0s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	59s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	49s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	1m 1s
units / internal / 🧪 Unit Tests: Internal (2, 8)	1m 6s
units / internal / 🧪 Unit Tests: Internal (8, 8)	53s
units / internal / 🧪 Unit Tests: Internal (6, 8)	58s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	1m 1s
units / internal / 🧪 Unit Tests: Internal (1, 8)	52s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	54s
units / internal / 🧪 Unit Tests: Internal (4, 8)	1m 6s
units / internal / 🧪 Unit Tests: Internal (3, 8)	1m 2s
units / internal / 🧪 Unit Tests: Internal (7, 8)	55s
units / internal / 🧪 Unit Tests: Internal (5, 8)	1m 3s
units / packages / 📊 Merge Reports	26s
units / webapp / 📊 Merge Reports	22s
units / internal / 📊 Merge Reports	24s
	24m 1s

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