subflow with taps

// ============================================================================
// Test: Taps on Subflows
// Feature: Taps should fire when subflows transition through branches
// Verifies: inline tap emission works for subflow continuations
// ============================================================================

~import std/taps

const std = @import("std");

// Base event: adds 5 to a number
~tor add-five { value: i32 } -> i32

~proc add-five|zig {
    std.debug.print("add_five: {} + 5 = {}\n", .{value, value + 5});
    return value + 5;
}

// Subflow that calls add-five
~tor double { value: i32 } -> i32

~double = add-five(value): r -> r

// Observer that should be called by the tap
~tor observer {}

~proc observer|zig {
    std.debug.print("TAP FIRED: add_five -> result transition observed!\n", .{});
}

// Print final result
~tor print-final { value: i32 }

~proc print-final|zig {
    std.debug.print("Final: {}\n", .{value});
}

// TAP: observe add-five's bare-return transition; `: v` binds the produced
// value (unused here — the observer just fires), mirroring 508/505.
~tap(add-five -> *): v |> observer()

// Execute the subflow - tap should fire
~double(value: 10): r |> print-final(value: r)