✍️ Scribe: Fix broken quickstart onboarding path

[fderuiter]

✍️ Scribe: Fix broken quickstart onboarding path

💡 What: Added load_dotenv() from python-dotenv to the quick start examples (examples/quick_start.py and examples/async_quick_start.py) and updated the README.md to reflect this code addition. Removed the confusing caveat that warned users they had to add this themselves.

🎯 Why: The previous README.md instructed users to copy .env.example to .env to authenticate, but running the examples failed with a misleading "API key required" error because the code didn't actually parse the .env file. This is a common and immediate blocker for new users.

🧠 Cognitive Impact: Fixes a first-run crash. A new developer can now copy .env.example, fill it out, and immediately run poetry run python examples/quick_start.py successfully. This matches the behavior of the CLI and eliminates a frustrating "why isn't my config working?" moment.

📖 Preview:

from dotenv import load_dotenv

# Load environment variables from .env file if it exists
load_dotenv()

# Load credentials from environment variables
cfg = load_config()

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PR created automatically by Jules for task 7375829949248800299 started by @fderuiter

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