USB Module

src/usb.rs — USB detection and capacity checks (platform-specific).

Implementation: USB — Auto-Detect Capacity IMPL-USB-001

status: implemented tags: usb, capacity, detection release: v1.0 realizes: FR-TRANSFER-002

get_available_space queries available bytes on the destination volume. Platform-specific: macOS (/Volumes/*), Linux (/media/$USER/*).

Implementation: USB — Sync Safely IMPL-USB-002

status: implemented tags: usb, sync, safety release: v1.0 realizes: FR-TRANSFER-040

sync_filesystem calls the platform sync syscall to flush buffers before the user removes the drive.