fix(core,cli): stop chat.agent uncaught exception on mid-stream abort #6758

Job	Run time
Detect changes	3s
packages / 🧪 Unit Tests: Packages (1, 1)	3m 52s
typecheck / typecheck	7m 44s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 45s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	3m 43s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	4m 9s
sdk-compat / Bun Runtime	2m 12s
webapp / 🧪 Unit Tests: Webapp (2, 8)	5m 16s
webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 49s
webapp / 🧪 Unit Tests: Webapp (5, 8)	6m 2s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 57s
webapp / 🧪 Unit Tests: Webapp (4, 8)	8m 47s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 50s
webapp / 🧪 Unit Tests: Webapp (1, 8)	6m 44s
sdk-compat / Deno Runtime	3m 0s
sdk-compat / Node.js 22.12 (ubuntu-latest)	2m 13s
webapp / 🧪 Unit Tests: Webapp (8, 8)	7m 17s
internal / 🧪 Unit Tests: Internal (3, 8)	9m 21s
sdk-compat / Cloudflare Workers	2m 44s
sdk-compat / Node.js 20.20 (ubuntu-latest)	2m 13s
internal / 🧪 Unit Tests: Internal (8, 8)	5m 46s
internal / 🧪 Unit Tests: Internal (4, 8)	5m 55s
internal / 🧪 Unit Tests: Internal (2, 8)	13m 8s
internal / 🧪 Unit Tests: Internal (1, 8)	7m 5s
internal / 🧪 Unit Tests: Internal (5, 8)	7m 2s
internal / 🧪 Unit Tests: Internal (7, 8)	6m 30s
internal / 🧪 Unit Tests: Internal (6, 8)	6m 15s
webapp / 🧪 Unit Tests: Webapp (6, 8)	4m 15s
webapp / 🧪 Unit Tests: Webapp (7, 8)	10m 0s
packages / 📊 Merge Reports	22s
webapp / 📊 Merge Reports	45s
internal / 📊 Merge Reports	26s
All PR Checks	2s
	2h 34m 12s

Provide feedback