feat: add USB Power Delivery Trigger HAT tutorial#708
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Add comprehensive tutorial for building a USB PD Trigger HAT using the CH224K controller. Includes: - Step-by-step circuit design with interactive previews - USB PD protocol explanation and voltage negotiation - CH224K configuration via resistor strapping (5V-20V) - Input/output filtering with capacitor sizing - Status LED indicator circuit - Complete bill of materials - Python monitoring script - Safety considerations for high-power USB PD - PCB layout with component placement guide Closes tscircuit#601
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/claim #601
Summary
Adds a comprehensive tutorial for building a USB Power Delivery Trigger HAT for Raspberry Pi using the CH224K PD controller.
What's included
Format
Follows the exact same pattern as the existing Buzzer HAT tutorial:
Requirements from issue #601