After accomplishing Task 2, see Codex_Response... for details.

tools/README.md

@@ -0,0 +1,32 @@
+# LXMessage Test-Vector Tooling
+
+The scripts in this directory verify the implementation-derived LXMessage
+packing behavior described in `Code_Response_1.md`.
+
+They use only Perl core modules. The local `LXMF::MessagePack` module implements
+the MessagePack subset needed to generate the vectors and parse their complete
+payloads.
+
+Generate deterministic vectors:
+
+```sh
+perl tools/make_test_vectors.pl
+```
+
+Verify the vectors:
+
+```sh
+perl tools/verify_examples.pl
+```
+
+The vectors confirm:
+
+- the 16-byte destination hash, 16-byte source hash, and 64-byte signature
+  positions;
+- payload order `[timestamp, title, content, fields, optional_stamp]`;
+- float64 timestamp and binary title/content/stamp encodings;
+- the message ID calculation;
+- exclusion of the optional stamp from the message ID and signature input.
+
+The signature bytes are deterministic placeholders. These vectors do not claim
+to verify Ed25519 signing or signature validation.