Cache static and dynamic library products alongside frameworks

The module cache now treats static and dynamic library targets as cacheable binary products alongside frameworks. Cache warm produces library XCFrameworks via xcodebuild -create-xcframework -library and includes -headers when the source target declares public headers. On restore, cached library graphs now expose Swift module directories and public C/Objective-C headers through the standard HeadersPath metadata Xcode writes into XCFramework Info.plist, so generated projects can compile against restored library artifacts without re-building from source.