docs: README quickstart crashes on copy-paste (missing `import asyncio`) and tutorial list is out of sync

[Koukyosyumei]

Problem

Two small but user-facing problems in README.md:

1. The quickstart snippet doesn't run as written.

The code block in section 2. Quickstart (README.md, lines ~48–72) starts with only:

from h5i.orchestra import Conductor

but then uses asyncio.gather(...) and asyncio.run(main(...)). Copy-pasting it into ensemble.py and running python ensemble.py — exactly what the README tells you to do — fails immediately with:

NameError: name 'asyncio' is not defined

This is the very first code a new user runs, so it's worth getting right.

2. The tutorial list in section 3. Examples is out of sync with examples/tutorial/.

The directory contains 9 scripts, but the README lists only 7:

• pipeline_score.py is missing from the list.
• quorum_ensemble.py is missing from the list.
• The entry for debate_then_build.py says "architect-to-implementer pipelines" — but that's actually what pipeline_score.py does (see its docstring: "architect designs, implementer builds, hardener tests"). debate_then_build.py is about settling a design question via debate before building.

Suggested fix

• Add import asyncio to the quickstart code block.
• Add pipeline_score.py and quorum_ensemble.py to the section-3 list, with one-line descriptions taken from their header docstrings.
• Correct the debate_then_build.py description (debate to settle a design question, then build).
• Bonus: examples/README.md also omits quorum_ensemble.py from its run list and tables — add it there too.

Docs-only change, no code knowledge required beyond reading the example docstrings. A great first contribution.