142 nominal in pipeline

// RED PIN (type-system design walk, 2026-07-06/07). Intent kept
// (nominal primitive types as event parameters), dead `~const(...) |
// as` form replaced with the flat const declaration (decls are
// module-scope, visible to sibling flows). Under the registry design,
// Username/UserId are registry entries and the call-site argument
// types are checked against them at the Koru layer.

~import std/types
~import std/io

const std = @import("std");

// Define nominal types
~string(Username)
~int(UserId)

// Event that takes nominal types
~event greet-user { name: Username, id: UserId }

~proc greet-user|zig {
    std.debug.print("Hello {s} (ID: {d})\n", .{ name, id });
}

~const { user: "alice", uid: 42 }

~greet-user(name: user, id: uid)