Conditionally include E2E target on macOS only, restore Linux tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: RISCfuture

.github/workflows/ci.yml

@@ -47,7 +47,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Build
-        run: swift build --target SwiftCIFP -v
+        run: swift build -v
+      - name: Test
+        run: swift test -v
   lint:
     name: Run Swiftlint
     runs-on: ubuntu-latest

Package.swift

@@ -28,15 +28,20 @@ let package = Package(
       name: "SwiftCIFPTests",
       dependencies: ["SwiftCIFP"]
     ),
+  ],
+  swiftLanguageModes: [.v5, .v6]
+)
+
+#if os(macOS)
+  package.targets.append(
     .executableTarget(
       name: "SwiftCIFP_E2E",
       dependencies: [
         "SwiftCIFP",
         .product(name: "ArgumentParser", package: "swift-argument-parser"),
         .product(name: "ZIPFoundation", package: "ZIPFoundation"),
-        .product(name: "Progress", package: "Progress.swift")
+        .product(name: "Progress", package: "Progress.swift"),
       ]
     )
-  ],
-  swiftLanguageModes: [.v5, .v6]
-)
+  )
+#endif