test: add CI verification for README examples

[aridyckovsky]

Add automated testing to ensure README examples stay accurate and in sync with CLI behavior.

Approach:

1. Create pnpm run doc-test script
2. Extract and run key examples (thread add/list, audit)
3. Verify output matches documented examples
4. Run in CI on every PR

Benefits:

• Prevents documentation drift
• Catches breaking changes early
• Increases confidence in examples

File: README.md

Review: docs/agents/prs/reviews/amp/feat-thread-command.md

[Adarsh311002]

Hi! I’m new to open source and would love to work on this issue as my first contribution.
Could you please assign it to me or confirm if I can start working on it?