fix: LISP-STRUCTURAL-CHECK error by separating tests from main lisp files; fix T-as-variable in system-archivist, programming-org, system-memory; fix SOME arg count in org-privacy-tag-p

- Separated test code from programming-lisp.org and programming-org.org into tests/ directory (was tangled to main lisp/, causing LOADER ERROR because export hadn't run yet)
- Added eval-when to load fiveam before test defpackage
- Renamed t→tag in lambda parameters in system-archivist, programming-org
- Renamed t→obj-type in let binding in system-memory
- Fixed missing lambda close paren in org-privacy-tag-p (SOME called with 1 arg)

lisp/system-archivist.lisp

@@ -60,7 +60,7 @@ Returns a list of plists: (:title <str> :content <str> :tags <list>)."
           (setf in-properties nil))
         (when (and in-properties (uiop:string-prefix-p ":TAGS:" trimmed))
           (setf current-tags
-                (mapcar (lambda (t) (string-trim '(#\Space) t))
+                (mapcar (lambda (tag) (string-trim '(#\Space) tag))
                         (uiop:split-string (string-trim '(#\Space) (subseq trimmed 6))
                                            :separator '(#\space #\tab)))))
         (cond