007 binding annotations

// Test: Binding annotations in continuations
// Verifies parser accepts annotations on binding variables: | branch binding[annotation] |>

const std = @import("std");

~event get_data {}
| result { value: i32 }

~proc get_data {
    return .{ .result = .{ .value = 42 } };
}

// This event mutates the value it receives via a pointer
~event mutate_and_print { ptr: *i32 }
| done {}

~proc mutate_and_print {
    ptr.* += 1;  // Mutate the value
    std.debug.print("Value: {d}\n", .{ptr.*});
    return .{ .done = .{} };
}

// Test: Using [mutable] annotation so we can pass a mutable pointer
~get_data()
| result r[mutable] |> mutate_and_print(ptr: &r.value)
  | done |> _