XCFramework Headers root added for cached static-objc-behind-dynamic deps

Static-objc-behind-dynamic xcframeworks (such as ARCore) now resolve correctly when consumed from the binary cache. The matcher adds the XCFramework Headers root for cached static-behind-dynamic dependencies, prefixed sibling headers (ARCoreGARSession.h etc.) are found, and flat layouts dedupe to no-op. Without this, anyone on 4.201.0-rc.x caching ARCore still hit file not found errors.