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/token.zig

@@ -105,6 +105,7 @@ pub const Tag = enum {
     hash_compiler, // #compiler
     hash_foreign, // #foreign
     hash_library, // #library
+    hash_framework, // #framework
     hash_using, // #using
     hash_include, // #include (inside #import c { ... })
     hash_source, // #source (inside #import c { ... })