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/programming-standards.org

@@ -89,6 +89,8 @@ CLOSED: [2026-05-02 Sat 18:00]
 ** Standards Enforcement
 ;; REPL-VERIFIED: 2026-05-03T13:00:00
 #+begin_src lisp
+(in-package :passepartout)
+
 (defun standards-git-clean-p (dir)
   "Checks if a directory has uncommitted changes."
   (let ((status (uiop:run-program (list "git" "-C" (namestring dir) "status" "--porcelain")