Update compile-time resolution and tests

AGENTS.md

@@ -6,3 +6,9 @@
 - If you need a wrapper for delegated properties, check for `getValue` explicitly and return a concrete `Statement` object when missing; avoid `onNotFoundResult` lambdas.
 - If wasmJs browser tests hang, first run `:lynglib:wasmJsNodeTest` and look for wasm compilation errors; hangs usually mean module instantiation failed.
 - Do not increase test timeouts to mask wasm generation errors; fix the invalid IR instead.
+
+## Type inference notes (notes/type_system_spec.md)
+- Nullability is Kotlin-style: `T` non-null, `T?` nullable, `!!` asserts non-null.
+- `void` is a singleton of class `Void` (syntax sugar for return type).
+- Object member access requires explicit cast; remove `inspect` from Object and use `toInspectString()` instead.
+- Do not reintroduce bytecode fallback opcodes (e.g., `GET_NAME`, `EVAL_*`, `CALL_FALLBACK`) or runtime name-resolution fallbacks; all symbol resolution must stay compile-time only.