Add Jest E2E tests for trueforge-core

[ramantehlan]

Summary

Adds a Jest E2E harness for @truefoundry/trueforge-core with a mocked LLM and a first orchestrator loop test.

Changes

• Separate tests/e2e tree and jest.e2e.config.cjs, kept out of unit Jest
• pnpm test:e2e / pnpm test:trueforge-core:e2e; core pnpm test runs units then E2E
• Sample test: mocked text LLM, no tools, send + execute through AgentThreadOrchestrator

How was this tested?

• pnpm --filter @truefoundry/trueforge-core test:e2e
• pnpm --filter @truefoundry/trueforge-core typecheck

Checklist

• I have read the contributing guidelines
• pnpm build, pnpm test, pnpm typecheck, pnpm lint:ci, and pnpm format:check pass locally
• Tests added/updated where it makes sense
• No hand-edits to generated code (packages/trueforge-sdk, .github/fern/openapi/openapi.json, docs/openapi.json) — fork PRs omit SDK regen; maintainers regenerate after merge
• Docs / .env.example updated if configuration or behavior changed

---

Note

Low Risk
Test and CI wiring only; no production runtime or API behavior changes.

Overview
Introduces a separate Jest E2E path for @truefoundry/trueforge-core: tests/e2e/ runs via jest.e2e.config.cjs (longer timeout, single worker) while unit Jest excludes that tree so suites do not double-run.

Scripts: core pnpm test now runs unit Jest then E2E; pnpm test:e2e and root pnpm test:trueforge-core:e2e run E2E only. tsconfig.json includes the new config file.

First E2E case: mocked streaming text LLM helpers plus a test that drives AgentThreadOrchestrator through send → execute, asserting model stream events, terminal AGENT_DONE, execution result, and persisted thread context—with no tools or sub-agents.

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Latest commit: 7974d6c

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