Add travel experience recommender domain

[OWConnoi]

Summary

Adds a distinct travel-experience recommender domain for the paid expansion bounty in aolabsai/ao_pyth#9.

The demo includes:

• a local 14-experience travel catalog across culture, food, nature, history, nightlife, wellness, family, and adventure
• an eight-bit feature encoding that matches the existing AO architecture shape [3, 2, 1, 2]
• a Streamlit travel recommender with traveler mood, budget, pace, and party controls
• optional live AO Agent scoring/training when ao_core and ao_arch are installed
• deterministic fallback ranking so reviewers can run the domain without private AO packages
• focused unit tests for encoding, budget ranking, and feedback learning behavior

Verification

• python3 -m unittest discover -s tests
• python3 -m py_compile travel_domain.py travel_recommender.py tests/test_travel_domain.py
• git diff --check

Run the demo with:

streamlit run travel_recommender.py