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Fix Walker environment to run with modern Python/numpy stack#1

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ckgresla wants to merge 5 commits intomainfrom
claude/fix-walker-binary-pEz6Q
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Fix Walker environment to run with modern Python/numpy stack#1
ckgresla wants to merge 5 commits intomainfrom
claude/fix-walker-binary-pEz6Q

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  • Update env_test.py to use local UnityToGymWrapper instead of gym_unity
    (the gym_unity package has Python 3.11+ compatibility issues)
  • Add run_walker_demo.py script for testing the Walker with random actions

- Update env_test.py to use local UnityToGymWrapper instead of gym_unity
  (the gym_unity package has Python 3.11+ compatibility issues)
- Add run_walker_demo.py script for testing the Walker with random actions
Updated metadata generated when testing the environment on Linux.
- walker_demo.mp4: Visualization of the Walker agent running with random actions
  Shows observation state, action values, and reward metrics over 3 episodes
- create_walker_video.py: Script to generate visualization from headless environment
- capture_video.py: Attempted Unity renderer capture (requires GPU)

The video shows the 243-dim observation space and 39-dim action space
controlling the bipedal walker's joints in real-time simulation.
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