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/sema.zig

@@ -868,6 +868,7 @@ pub const Analyzer = struct {
             .compiler_expr,
             .foreign_expr,
             .library_decl,
+            .framework_decl,
             .function_type_expr,
             .closure_type_expr,
             .import_decl,
@@ -1274,6 +1275,7 @@ pub fn findNodeAtOffset(node: *Node, offset: u32) ?*Node {
         .compiler_expr,
         .foreign_expr,
         .library_decl,
+        .framework_decl,
         .function_type_expr,
         .enum_decl,
         .union_decl,