fix: add (in-package :passepartout) to 5 skill files missing it

Eliminates COMMON-LISP-USER::DEFSKILL and other package-related
STYLE-WARNINGs during compilation. Files affected:
- gateway-messaging, programming-repl, programming-standards,
  system-memory, system-archivist
Remaining warnings are cross-skill references (vault functions)
and minor same-file forward refs — category 2 per ROADMAP.

org/system-memory.org

@@ -12,6 +12,8 @@ Because Lisp is homoiconic (code is data), memory objects can be read as executa
 
 ;; REPL-VERIFIED: 2026-05-03T13:00:00
 #+begin_src lisp
+(in-package :passepartout)
+
 (defun memory-inspect (&key (type-filter nil) (todo-filter nil) (limit 10))
   "Returns a structured report of memory state.
 Optional filters: TYPE-FILTER (keyword), TODO-FILTER (string).