jsx support

[cs01]

JSX support, declare function FFI, and native compiler fixes

Summary

• JSX support: Parser desugars <Tag prop={v}>child</Tag> into createElement("Tag", {prop: v}, [child]) calls. Supports attributes, expressions, fragments, nesting, and self-closing elements. 6 test fixtures cover the feature.
• declare function FFI: Zero-cost foreign function interface via declare function syntax. Supports typed parameters (i32, i64, f32, f64, i8_ptr, etc.) that map directly to LLVM types without double conversion. Linker flags (-lm, -lpthread, etc.) are auto-detected from linked libraries.
• Zireael TUI example: Two demo apps (examples/tui/app.tsx imperative, examples/tui/app-jsx.tsx JSX) showing a native terminal UI counter built with the Zireael C bridge.
• Fix native compiler segfault: Removed TBAA (Type-Based Alias Analysis) metadata from all codegen load/store instructions. The TBAA hierarchy incorrectly declared double and pointer types as non-aliasing, causing LLVM -O2 to miscompile structs containing both field types. Also fixed FunctionNode struct layout mismatch in native parser creation sites, and switched declaredExternFunctions from Set<string> to string[] to fix duplicate declaration errors during self-hosting.

Test plan

• All 241 tests pass (npm test)
• Self-hosting Stage 0 + Stage 1 pass (npm run verify:quick)
• declare function compiles without segfault (previously crashed at -O2)
• JSX test fixtures: basic, attributes, expressions, fragments, nested, self-closing
• Prettier check passes (npx prettier --check .)