053 braceless continuation constructors

// Test: Braceless branch constructors in flow continuations
//
// This tests the identity branch constructor syntax INSIDE flows:
//   | branch r |> done           (empty identity)
//   | branch r |> result r.value (identity with expression)
//
// This complements 100_052 which tests subflow syntax.

~import std/io

// Source event
~pub event compute { x: i32 }
| value i32

~proc compute|zig {
    return .{ .value = x * 2 };
}

// Result event with identity branches
~pub event result {}
| ok i32

// Wrapper that uses braceless constructors in continuations
~pub event run-test {}

~proc run-test|zig {
    // This internally tests braceless continuation constructors
}

// Subflow using braceless identity in continuation
~event process { input: i32 }
| result i32

~process = compute(x: input)
| value v => result v

// Main test
~std/io:print.ln("Testing braceless in continuation:")
~process(input: 21)
| result r |> std/io:print.ln("  Got result: {{ r:d }}")