183 reject omitted required param

// PIN — omitting a REQUIRED tor input at the call site is a refusal, not a
// silent hole.
//
// Measured 2026-08-02, ten months into the language: this exact program
// compiled clean and RAN, printing `1`. `b` is declared, never supplied, and
// nothing said so. Make the impl actually USE `b` and it becomes
// `output_emitted.zig:51: error: use of undeclared identifier 'b'` — a raw Zig
// error in generated code, at a line number that means nothing to the author.
//
// KORU080 ("missing required field") was declared in the registry the whole
// time and emitted from exactly ONE place: koru_std/testing.kz, for mock
// branches. Every library author who cared hand-rolled their own wall instead
// (std/parser:parse's "needs its grammar named", std/store:insert's "requires a
// store name") — which is what a missing general wall looks like from outside.
//
// The silent variant is pinned deliberately: an omitted argument the impl never
// reads is the one a raw Zig error can never catch.
~import std/io

~tor add { a: i32, b: i32 } -> i32

~add -> a

~add(a: 1): r |> std/io:print.ln("{{ r:d }}")