fix(ci): gate Pico reset matcher on Windows

[zackees]

Follow-up to #1304.\n\nThe Pico reset compatible-ID matcher is used only by the Windows implementation, but the merged code compiled it unconditionally. Linux and macOS -D warnings jobs therefore failed on dead code before reaching their board builds.\n\n- Compile the helper for Windows production builds and all test builds.\n- Preserve the cross-platform protocol unit test.\n\nValidation:\n- managed Linux container: soldr cargo check -p fbuild-serial --lib passed\n- managed Linux container: soldr cargo check -p fbuild-serial --tests passed\n- Windows focused matcher unit test passed\n- rustfmt and diff checks passed\n- incremental pre-push review clean

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• crates/fbuild-serial/src/ports.rs

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