feat(rp2040): warn on failed USB devices

[zackees]

Detect present Windows USB devnodes with non-zero problem codes, report problem code and USB topology during fbuild port scan, and recommend direct motherboard USB connections when an external hub is detected. The diagnostic is non-fatal and never associates unidentified nodes with a target board. Closes #1087. Validation: focused warning tests, 150 fbuild-serial unit tests, all-target compile check, and live Windows scan with two Code 43 nodes detected.

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📥 Commits

Reviewing files that changed from the base of the PR and between a546913 and 0b6c41d.

📒 Files selected for processing (2)

• crates/fbuild-cli/src/cli/port_scan.rs
• crates/fbuild-serial/src/ports.rs

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/rp2040-usb-problem-warning

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