Kotlin typealias declarations dropped, so in-file references mint a sourceless god node #4553

Version

v8 @ 0.9.92 (86c57be)

Problem

A Kotlin typealias is a named type, but type_alias is in neither class_types nor function_types, so the declaration is dropped. A property or parameter typed as the alias still resolves the name through ensure_named_node, which mints a sourceless stub and points the references edge at it — even though the alias is declared in the same file.

That violates the provenance invariant (a real source-backed declaration losing to a sourceless god node; the bare-id stub becomes a cross-file hub). Scala and TypeScript already model type aliases as nodes, so Kotlin is the inconsistent outlier.

Reproduce

typealias ClickHandler = (Int) -> Unit
class Button {
    var onClick: ClickHandler? = null
    fun handler(h: ClickHandler) { onClick = h }
}

ClickHandler appears as a node with empty source_file; Button/handler reference that sourceless node.

Expected vs actual

• Expected: ClickHandler is a sourced node in the declaring file; references bind to it.
• Actual: ClickHandler is sourceless; references bind to the stub.

Notes

type_alias has an identifier name (covered by name_fallback_child_types) and no body, so it emits a clean empty type node (no phantom members).