Remove four private single-impl interfaces (usbEventListener,
darwinUSBHostDeviceWatch, darwinServerDataDevice, darwinEndpointStateMachine)
and both function-table DI seams (usbipOps, darwinServerOps); production calls
the underlying functions directly. Inline ~25 single-call helpers and fuse
subordinate routines into their sole caller. Collapse single-field helper
structs into their underlying types. Fold server_linux.go/server_darwin.go
into host_linux.go/host_darwin.go.
Delete change-detector tests per .claude/rules/code-test.md: parse round-trip,
mirror, input-validation, and builder-property suites that never exercised
real syscalls, network, or cgo. Six test files removed; linux_test.go slimmed
to three real-system tests; darwin_integration_test.go retains the six
real-cgo tests. Surviving suite: 16 tests that all exercise real OS APIs or
spawn the official Linux usbip server.
Net: -5100 LoC (~37% of the package).
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