fix(test): sync ios-qa fixture mirrors with the #2585 DEBUG-guard templates

The #2585 absorb updated DebugBridgeTouch.m.template and
Package.swift.template but not their FixtureApp mirrors, failing the
template↔fixture parity gate. DebugBridgeTouch.m syncs byte-for-byte; the
fixture Package.swift takes only the template's new cSettings DEBUG define on
the Touch target (the fixture's own testTarget is fixture-only content the
parity normalization deliberately ignores — a naive full copy breaks the
XCTest invariant). 23/23 including the real swift build.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/fixtures/ios-qa/FixtureApp/Package.swift

@@ -32,7 +32,17 @@ let package = Package(
             dependencies: [],
             path: "Sources/DebugBridgeTouch",
             publicHeadersPath: "include",
+            cSettings: [
+                // Explicit, because the source guard depends on it. SwiftPM's
+                // implicit DEBUG for C-family targets is not something to bet a
+                // private-API exposure on — the two Swift targets already declare
+                // it, and this target is the one that actually links private API.
+                .define("DEBUG", .when(configuration: .debug)),
+            ],
             linkerSettings: [
+                // IOKit is loaded dynamically via dlopen at runtime (it's a
+                // private framework on iOS and can't be linked statically).
+                // UIKit links normally.
                 .linkedFramework("UIKit", .when(platforms: [.iOS])),
             ]
         ),