Initial commit: PRU LED firmware and HTTP service

- Combined PRU0 firmware for both mood (56 LED) and jaw (24 LED) strips
- Uses P9_27 and P9_25 (free pins, not HDMI locked)
- Python HTTP service on port 8765
- Named states: idle, listening, responding, pleasure, thinking, playful, commanding, love, sleep
- Setup scripts for fresh BBB deployment

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.gitignore

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+# Build artifacts
+*.obj
+*.map
+am335x-pru*-fw
+
+# Python
+__pycache__/
+*.pyc
+*.pyo
+.env
+
+# Editor
+*.swp
+*.swo
+*~
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db