[codex] Add movie-domain recommender demo

[dclawd88]

Summary

• add a movie-domain dataset and deterministic binary encoder for genre, runtime, recency, rating, and mood
• add a Streamlit movie recommender demo with a live AO Agent path plus a local deterministic fallback
• document the new demo and add unit tests for the movie-domain mapping

Bounty context

This implements a new recommender domain for aolabsai/ao_pyth#9 using the existing Recommender pattern.

Validation

• python3 -m unittest discover -s tests
• python3 -m py_compile movie_domain.py movie_recommender.py arch__MovieRecommender.py tests/test_movie_domain.py