refactor(serial): derive bootloader signatures from FastLED/boards

[zackees]

Closes the bootloader-watcher gap in #1047 and #1049.\n\n- production RP2040/SAMD/Teensy bootloader matching uses typed FastLED/boards profiles\n- exact USB identities remain cfg(test)-only fixtures\n- adds semantic profile mapping tests and updates the USB audit\n\nValidation:\n- 11 bootloader_watcher tests passed\n- strict clippy passed\n- rustfmt and diff check passed

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📥 Commits

Reviewing files that changed from the base of the PR and between 017875a and 1961996.

📒 Files selected for processing (2)

• crates/fbuild-serial/src/bootloader_watcher.rs
• docs/usb-vidpid-audit.md

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• Create PR with unit tests
• Commit unit tests in branch refactor/usb-profile-bootloader-watch

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