051 runtime run budget autodischarge

// codemod:skip — runtime-eval blocks use internal (snake) names; flow_parser does not normalize.
// Test: std/runtime:run auto-discharges on budget exhaustion

~import std/runtime
~import std/io

const std = @import("std");

~pub event open-handle {}
| opened []const u8<opened!>

~proc open-handle|zig {
    std.debug.print("OPEN\n", .{});
    return .{ .opened = "h1" };
}

~pub event close-handle { handle: []const u8<!opened> }

~proc close-handle|zig {
    std.debug.print("CLOSE\n", .{});
}

~pub event step {}

~proc step|zig {
    std.debug.print("STEP\n", .{});
}

~std/runtime:register(scope: "api") {
    open-handle(1)
    close-handle(1)
    step(1)
}

const TEST_SOURCE = "~open-handle()\n| opened _ |> step()";

~std/runtime:run(source: TEST_SOURCE, scope: "api", budget: 1)
| result _ |> std/io:print.ln("OK")
| exhausted _ |> std/io:print.ln("EXHAUSTED")
| parse-error _ |> std/io:print.ln("PARSE ERROR")
| validation-error _ |> std/io:print.ln("VALIDATION ERROR")
| shape-error _ |> std/io:print.ln("SHAPE ERROR")
| event-denied _ |> std/io:print.ln("EVENT DENIED")
| dispatch-error _ |> std/io:print.ln("DISPATCH ERROR")
| scope-not-found _ |> std/io:print.ln("SCOPE NOT FOUND")