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.

lisp/gateway-messaging.lisp

@@ -1,3 +1,5 @@
+(in-package :passepartout)
+
 (defvar *gateway-configs* (make-hash-table :test 'equal)
   "Maps platform name to plist (:token :thread :interval :enabled)")
 

lisp/programming-repl.lisp

@@ -1,3 +1,5 @@
+(in-package :passepartout)
+
 (defvar *repl-package* :passepartout
   "Default package for REPL evaluations.")
 

lisp/programming-standards.lisp

@@ -1,3 +1,5 @@
+(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")

lisp/system-archivist.lisp

@@ -1,3 +1,5 @@
+(in-package :passepartout)
+
 (defvar *archivist-last-scribe* 0
   "Universal time of the last Scribe distillation run.")
 

lisp/system-memory.lisp

@@ -1,3 +1,5 @@
+(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).