fix: skill loader preserves test-package in-package forms, un-jail security-dispatcher

- skill-package-forms-strip: only strip (in-package :passepartout),
  preserving test-package declarations. This allows embedded test code
  to evaluate in the correct package, fixing 7 previously-unreachable
  test suites (vault, perms, policy, validator, lisp, org, archivist).
- Remove security-dispatcher from skill-topological-sort exclusion:
  dispatcher was never loaded (neither via ASDF nor skill system).
  Test package was previously NIL; now loads properly.

Test results: 146 pass, 16 fail (was 80P 1F).
Remaining failures are pre-existing test code bugs (variable access
across jailed packages, cleanup errors) now exposed by the fix.

lisp/core-skills.lisp

@@ -96,7 +96,6 @@
                                     (string= n "core-loop-act")
                                     (string= n "core-loop")
                                     (string= n "core-manifest")
-                                    (string= n "security-dispatcher")
                                     (string= n "system-model-router")
                                     (string= n "system-model-explorer")
                                     (string= n "gateway-tui"))))
@@ -154,13 +153,15 @@
     (error (c) (values nil (format nil "~a" c)))))
 
 (defun skill-package-forms-strip (code-string)
-  "Removes in-package forms so symbols get defined in skill package."
+  "Removes (in-package :passepartout) forms only — preserves test-package
+declarations so embedded test code evaluates in the correct package."
   (let ((lines (uiop:split-string code-string :separator '(#\Newline)))
         (result ""))
     (dolist (line lines)
       (let ((trimmed (string-trim '(#\Space #\Tab) line)))
-        (unless (uiop:string-prefix-p "(in-package" trimmed)
-          (setf result (concatenate 'string result line (string #\Newline))))))
+        (if (uiop:string-prefix-p "(in-package :passepartout)" trimmed)
+            (setf result (concatenate 'string result (string #\Newline)))
+            (setf result (concatenate 'string result line (string #\Newline))))))
     result))
 
 (defun tangle-target-extract (line)