WIP refactor: add remote_poc_test

test/remote_child_send.zig

@@ -0,0 +1,13 @@
+/// Child process for the remoting POC test.
+/// Writes one framed CBOR send_named message to stdout and exits.
+const std = @import("std");
+const cbor = @import("cbor");
+const framing = @import("framing");
+
+pub fn main() !void {
+    var msg_buf: [256]u8 = undefined;
+    var stream: std.Io.Writer = .fixed(&msg_buf);
+    try cbor.writeValue(&stream, .{ "send_named", @as(u64, 1), "test_actor", .{ "hello", "from_child" } });
+    const payload = stream.buffered();
+    try framing.write_frame(std.fs.File.stdout(), payload);
+}