Add cross-platform debugger detection implementation

Sources/OpenSwiftUICore/Util/Debugger.swift

@@ -0,0 +1,48 @@
+//
+//  Debugger.swift
+//  OpenSwiftUICore
+//
+//  Audited for 6.5.4
+//  Status: Complete
+
+#if canImport(Darwin)
+import Darwin
+import os
+
+package let isDebuggerAttached: Bool = {
+    var info = kinfo_proc()
+    var mib: [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()]
+    var size = MemoryLayout.stride(ofValue: info)
+
+    let result = sysctl(&mib, UInt32(mib.count), &info, &size, nil, 0)
+
+    guard result == 0 else {
+        os_log(.error, "sysctl(3) failed: %{errno}d", errno)
+        return false
+    }
+    return (info.kp_proc.p_flag & P_TRACED) != 0
+}()
+#else
+import Foundation
+
+package let isDebuggerAttached: Bool = {
+    guard let statusData = try? Data(contentsOf: URL(fileURLWithPath: "/proc/self/status")),
+          let statusString = String(data: statusData, encoding: .utf8) else {
+        return false
+    }
+
+    for line in statusString.components(separatedBy: .newlines) {
+        if line.hasPrefix("TracerPid:") {
+            let components = line.components(separatedBy: .whitespaces)
+            if components.count >= 2,
+               let tracerPid = Int(components[1]),
+               tracerPid != 0 {
+                return true
+            }
+            break
+        }
+    }
+
+    return false
+}()
+#endif

Tests/OpenSwiftUICoreTests/Util/DebuggerTests.swift

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+//
+//  DebuggerTests.swift
+//  OpenSwiftUICoreTests
+//
+//  Audited for 6.5.4
+//  Status: Complete
+//
+
+import Testing
+@testable import OpenSwiftUICore
+
+struct DebuggerTests {
+    @Test
+    func attached() {
+        #expect(isDebuggerAttached == false)
+    }
+}