fix(core,cli): stop chat.agent uncaught exception on mid-stream abort #6759

Job	Run time
Detect changes	3s
typecheck / typecheck	7m 18s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	4m 17s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 39s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 57s
sdk-compat / Bun Runtime	2m 6s
packages / 🧪 Unit Tests: Packages (1, 1)	11m 44s
sdk-compat / Deno Runtime	2m 4s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	6m 15s
sdk-compat / Cloudflare Workers	2m 26s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 53s
internal / 🧪 Unit Tests: Internal (2, 8)	13m 22s
internal / 🧪 Unit Tests: Internal (3, 8)	9m 50s
internal / 🧪 Unit Tests: Internal (6, 8)	5m 27s
internal / 🧪 Unit Tests: Internal (5, 8)	6m 42s
sdk-compat / Node.js 20.20 (ubuntu-latest)	2m 20s
sdk-compat / Node.js 22.12 (ubuntu-latest)	2m 15s
internal / 🧪 Unit Tests: Internal (4, 8)	5m 51s
internal / 🧪 Unit Tests: Internal (1, 8)	6m 32s
internal / 🧪 Unit Tests: Internal (7, 8)	6m 47s
webapp / 🧪 Unit Tests: Webapp (1, 8)	6m 35s
internal / 🧪 Unit Tests: Internal (8, 8)	5m 20s
webapp / 🧪 Unit Tests: Webapp (5, 8)	6m 10s
webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 45s
webapp / 🧪 Unit Tests: Webapp (4, 8)	8m 24s
webapp / 🧪 Unit Tests: Webapp (6, 8)	4m 26s
webapp / 🧪 Unit Tests: Webapp (2, 8)	4m 54s
webapp / 🧪 Unit Tests: Webapp (7, 8)	9m 24s
webapp / 🧪 Unit Tests: Webapp (8, 8)	6m 51s
webapp / 📊 Merge Reports	43s
packages / 📊 Merge Reports	26s
internal / 📊 Merge Reports	24s
All PR Checks	2s
	2h 40m 12s

Provide feedback