Describe the bug
Periphery seems to detect only public unused imports, not at other visibilities.
Either periphery should detect all visibilities of unused imports, or visibility limitations should be documented.
Reproduction
Add an unused private import to a file, then run periphery.
Environment
$ periphery version
3.7.2
$ swift -version
swift-driver version: 1.148.6 Apple Swift version 6.3.1 (swiftlang-6.3.1.1.2 clang-2100.0.123.102)
Target: arm64-apple-macosx26.0
$ xcodebuild -version
Xcode 26.4.1
Build version 17E202
Describe the bug
Periphery seems to detect only public unused imports, not at other visibilities.
Either periphery should detect all visibilities of unused imports, or visibility limitations should be documented.
Reproduction
Add an unused private import to a file, then run periphery.
Environment