003 style record unknown field

// FRONTIER (pinned RED) — COMPONENT_CHALLENGE replay 03 / Charm progress.
//
// Natural shape for a colored progress cell: a Style record literal with an
// `fg` color field (Charm purple #5A56E0). Koru accepts the unknown field
// through analysis and emission; only Stage-D Zig rejects it.
//
//   style: { bold: false, dim: false, fg: 0x5A56E0 }
//
// EXPECTED: Koru shape/analysis rejects unknown fields on a known struct type
// with a Koru diagnostic (and, for Charm progress, vaxis Style must grow a
// Color `fg`/`bg` surface that maps onto libvaxis Cell.Style — which already
// has them; the koru/vaxis wrapper strips them: "Boolean attrs only for now").
//
// ACTUAL: Stage-D zig build of output_emitted.zig fails with:
//   error: no field named 'fg' in struct '...Style'
//
// This pin is the minimal self-contained form (local Style, no vaxis import).
// The Charm meter also needs grapheme-aware writeCell (write-at currently
// walks bytes) and fill math inside the component boundary — floated in
// koru-libs vaxis/tests/frontier/charm_progress_walls.md.

const std = @import("std");

const Style = struct {
    bold: bool = false,
    dim: bool = false,
};

~pub tor write-styled { text: string, style: Style }

~proc write-styled|zig {
    _ = text;
    _ = style;
    std.debug.print("painted\n", .{});
}

~write-styled(text: "▌", style: { bold: false, dim: false, fg: 0x5A56E0 })