058 build config annotation quotes

// Test: build flag with multiple arguments survives quote escaping.
//
// `~[build("a", "b")]` carries two double-quoted strings with a comma —
// the worst-case shape for a string-escape bug since both inner quotes
// AND the comma must round-trip into the emitted Zig annotation array.

~import "$std/build"

~[build("debug", "trace")]std.build:config {
    "target": "x86_64-linux-gnu"
}

~pub event main { }

~proc main {
    const x: u32 = 1;
    _ = x;
}