ios + ir cleanup

- ios: --target ios/ios-sim shorthands, iOS SDK auto-discovery,
  #framework directive + BuildOptions.add_framework hook,
  .app bundle + Info.plist + codesign (ad-hoc and real),
  --codesign-identity/--provisioning-profile/--entitlements flags,
  modules/std/{objc,uikit}.sx, dynamic class registration,
  typed objc_msgSend cast pattern, UIApplicationMain handoff,
  UIWindow scene attach. Runs on iPhone hardware.
- ir: silent .s64 defaults → loud diagnostics,
  resolveReturnType infers from body, sub-byte int sizes match LLVM,
  tuple type interning includes names, compile errors exit 1
- issue-NNNN convention: resolved bugs rename to focused features
- 50 regression tests passing

examples/65-add-framework.sx

@@ -0,0 +1,20 @@
+// BuildOptions.add_framework registers an Apple framework at comptime,
+// equivalent to a top-level `#framework "Name"` directive. The advantage:
+// you can gate it with `inline if OS == .ios { ... }` or similar logic,
+// keeping the framework off non-Apple builds.
+
+#import "modules/std.sx";
+#import "modules/compiler.sx";
+
+configure_build :: () {
+    opts := build_options();
+    opts.add_framework("CoreFoundation");
+}
+#run configure_build();
+
+CFAbsoluteTimeGetCurrent :: () -> f64 #foreign;
+
+main :: () -> s32 {
+    t := CFAbsoluteTimeGetCurrent();
+    return if t > 0.0 then 0 else 1;
+}