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

tests/expected/08-types.txt

@@ -0,0 +1,4 @@
+a 0 : Foo{a: 0, b: 42, c: 124, d: 17}
+a 1 : Foo{a: 1, b: 42, c: 8, d: 17}
+b: Foo{a: 1, b: 1, c: 101, d: 1}
+Pack{a: 1, b: 0, c: 3, d: 5, f: 9, v: 100, x: 3.500000}