feat: UUIDv4 IDs, GTD conventions, backdate ROADMAP

- memory-id-generate now produces UUIDv4 (id-87917806-...)

- GTD Conventions added to programming-standards.org

- ROADMAP.org v0.3.0 tasks have :ID:, :CREATED:, :LOGBOOK:, CLOSED:

lisp/core-memory.lisp

@@ -19,8 +19,8 @@
     (nreverse results)))
 
 (defun memory-id-generate ()
-  "Generates a timestamp-based unique ID."
-  (format nil "id-~36r" (get-universal-time)))
+  "Generates a UUIDv4 unique ID. Compatible with Agora Note UUIDs."
+  (concatenate 'string "id-" (string-downcase (format nil "~a" (uuid:make-v4-uuid)))))
 
 (defstruct memory-object
   id type attributes content vector parent-id children version last-sync hash)