021 router bare return bind

// PINS: orisha:router inlines a continuation through continuation_codegen.
// A route that binds a bare-return tor (`usage(): u |> …`) must emit
// `const u = handler(...)`, not `switch (result) { . =>` — that is not Zig.
//
// 350_015 pins the same bind on the visitor_emitter/subflow path.
// 350_010's router arms are a single print, so they never asked this question.
// Ward's `/api/usage` is this shape.

~import orisha
~import std/io

const std = @import("std");

const TestRequest = struct {
    method: []const u8,
    path: []const u8,
};

const req = TestRequest{ .method = "GET", .path = "/api/usage" };

~tor usage {} -> { processor: i32, ram: i32, storage: i32 }

~proc usage|zig {
    return .{ .processor = 7, .ram = 11, .storage = 13 };
}

~orisha:router(req: &req)
! [GET /api/usage] |> usage(): u |> std/io:print.ln("{{ u.processor:d }}/{{ u.ram:d }}/{{ u.storage:d }}")
! [*] |> std/io:print.ln("miss")