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

src/ir/compiler_hooks.zig

@@ -9,11 +9,13 @@ const Interpreter = interp_mod.Interpreter;
 
 pub const BuildConfig = struct {
     link_flags: std.ArrayList([]const u8) = .empty,
+    frameworks: std.ArrayList([]const u8) = .empty,
     output_path: ?[]const u8 = null,
     wasm_shell_path: ?[]const u8 = null,
 
     pub fn deinit(self: *BuildConfig, alloc: Allocator) void {
         self.link_flags.deinit(alloc);
+        self.frameworks.deinit(alloc);
     }
 };
 
@@ -52,6 +54,7 @@ pub const Registry = struct {
     pub fn registerDefaults(self: *Registry) void {
         self.hooks.put("build_options", &hookBuildOptions) catch {};
         self.hooks.put("BuildOptions.add_link_flag", &hookAddLinkFlag) catch {};
+        self.hooks.put("BuildOptions.add_framework", &hookAddFramework) catch {};
         self.hooks.put("BuildOptions.set_output_path", &hookSetOutputPath) catch {};
         self.hooks.put("BuildOptions.set_wasm_shell", &hookSetWasmShell) catch {};
     }
@@ -87,6 +90,21 @@ fn hookAddLinkFlag(
     return .void_val;
 }
 
+fn hookAddFramework(
+    interp: *const Interpreter,
+    args: []const Value,
+    bc: *BuildConfig,
+    alloc: Allocator,
+) HookError!Value {
+    // args: [self (BuildOptions value), framework_name]
+    if (args.len < 2) return .void_val;
+    const str_val = args[1];
+    if (str_val.asString(interp)) |s| {
+        bc.frameworks.append(alloc, alloc.dupe(u8, s) catch return error.CannotEvalComptime) catch return error.CannotEvalComptime;
+    }
+    return .void_val;
+}
+
 fn hookSetOutputPath(
     interp: *const Interpreter,
     args: []const Value,