Add real oAITests target; remove disconnected SPM test scaffold

The old Tests/oAITests/oAITests.swift + root Package.swift/Sources/
were a swift package init stub that @testable imported a fake empty
oAI module, completely disconnected from the real ~31K-line app
(built only via oAI.xcodeproj). Running `swift test` there would
have silently "passed" while testing nothing.

oAITests is a proper Unit Testing Bundle target added via Xcode's
target editor, wired into the app's scheme (TestAction references
oAITests.xctest). Verified with `xcodebuild test` before and after
removing the dead scaffold.

First phase of the test-suite rollout plan (peaceful-baking-kurzweil).

Package.swift

@@ -1,26 +0,0 @@
-// swift-tools-version: 6.2
-// The swift-tools-version declares the minimum version of Swift required to build this package.
-
-import PackageDescription
-
-let package = Package(
-    name: "oAI",
-    products: [
-        // Products define the executables and libraries a package produces, making them visible to other packages.
-        .library(
-            name: "oAI",
-            targets: ["oAI"]
-        ),
-    ],
-    targets: [
-        // Targets are the basic building blocks of a package, defining a module or a test suite.
-        // Targets can depend on other targets in this package and products from dependencies.
-        .target(
-            name: "oAI"
-        ),
-        .testTarget(
-            name: "oAITests",
-            dependencies: ["oAI"]
-        ),
-    ]
-)

Sources/oAI/oAI.swift

@@ -1,2 +0,0 @@
-// The Swift Programming Language
-// https://docs.swift.org/swift-book

Tests/oAITests/oAITests.swift

@@ -1,6 +0,0 @@
-import Testing
-@testable import oAI
-
-@Test func example() async throws {
-    // Write your test here and use APIs like `#expect(...)` to check expected conditions.
-}

oAITests/oAITests.swift

@@ -0,0 +1,18 @@
+//
+//  oAITests.swift
+//  oAITests
+//
+//  Created by Rune Olsen on 23/07/2026.
+//
+
+import Testing
+
+struct oAITests {
+
+    @Test func example() async throws {
+        // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+        // Swift Testing Documentation
+        // https://developer.apple.com/documentation/testing
+    }
+
+}