Add Class D Audio Amplifier HAT tutorial#619
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Comprehensive tutorial for building a PAM8403-based stereo audio amplifier HAT. Covers Class D operation, audio signal path design, BTL output configuration, volume control, and Raspberry Pi audio configuration. Fixes tscircuit#603
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Summary
The tutorial delivers 3W per channel stereo output from the Pi's 5V rail.
Fixes #603
Test Plan