build: gate lib-vt xcframework on emit-xcframework with xcodebuild detection

example/swift-vt-xcframework/Package.swift

@@ -1,35 +1,6 @@
 // swift-tools-version: 5.9
-import Foundation
 import PackageDescription
 
-func existingXCFrameworkPath() -> String {
-    let fm = FileManager.default
-    let candidates = [
-        "../../zig-out/lib/ghostty-vt.xcframework",
-        "../../zig-out/xcframeworks/ghostty-vt.xcframework",
-        "../../zig-out/ghostty-vt.xcframework",
-    ]
-
-    for rel in candidates {
-        let plist = "\(rel)/Info.plist"
-        var isDir: ObjCBool = false
-        if fm.fileExists(atPath: rel, isDirectory: &isDir),
-            isDir.boolValue,
-            fm.fileExists(atPath: plist)
-        {
-            return rel  // important to return relative path
-        }
-    }
-
-    fatalError(
-        """
-        GhosttyVt XCFramework not found.
-        Build it first (must produce a valid *.xcframework with Info.plist).
-        Tried:
-        \(candidates.joined(separator: "\n"))
-        """)
-}
-
 let package = Package(
     name: "swift-vt-xcframework",
     platforms: [.macOS(.v13)],
@@ -38,11 +9,13 @@ let package = Package(
             name: "swift-vt-xcframework",
             dependencies: ["GhosttyVt"],
             path: "Sources",
-            linkerSettings: [.linkedLibrary("c++")]
+            linkerSettings: [
+                .linkedLibrary("c++"),
+            ]
         ),
         .binaryTarget(
             name: "GhosttyVt",
-            path: existingXCFrameworkPath()
+            path: "../../zig-out/lib/ghostty-vt.xcframework"
         ),
     ]
 )