- README.md: Add v4.0.1 to version history
- API.md: Update title and version in examples to v4.0.1
- CLI.md: Update title to v4.0.1
- WEB_UI.md: Update to v4.0.1, document channel key dropdown and LED indicators
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>