041 auto discharge single

// JavaScript implementation facet of module `fs`.
// Events and types are declared in fs.kz (merged at import); this file holds
// the |js proc bodies. The obligation lifecycle is what the test pins — the
// Zig facet's page_allocator.create(File) is incidental, so the handle is a
// plain object here.

~proc open|js {
    console.log("Opening file");
    return { handle: 42 };
}

~proc close|js {
    console.log("Closing file (auto-discharged)");
}

// Library module: fs
// Single disposal event - auto-discharge should work

const std = @import("std");

const File = struct { handle: i32 };

// Open a file - returns opened! state (requires cleanup)
~pub tor open { path: string } -> *File<opened!>

~proc open|zig {
    std.debug.print("Opening file\n", .{});
    const f = std.heap.page_allocator.create(File) catch unreachable;
    f.* = File{ .handle = 42 };
    return f;
}

// Close - the ONLY consumer of <!opened>
~pub tor close { file: *File<!opened> }

~proc close|zig {
    std.debug.print("Closing file (auto-discharged)\n", .{});
}