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/lexer.zig

@@ -72,6 +72,7 @@ pub const Lexer = struct {
                 .{ "#compiler", Tag.hash_compiler },
                 .{ "#foreign", Tag.hash_foreign },
                 .{ "#library", Tag.hash_library },
+                .{ "#framework", Tag.hash_framework },
                 .{ "#using", Tag.hash_using },
                 .{ "#include", Tag.hash_include },
                 .{ "#source", Tag.hash_source },