build: embed test scripts into org files and purge tests directory

- Embedded run-all-tests.lisp into harness/package.org.
- Deleted the tests/ directory and orphaned Python test scripts, as all other test files are correctly tangled from their parent org files.

tests/emacs-edit-tests.lisp

@@ -1,34 +0,0 @@
-(defpackage :opencortex-emacs-edit-tests
-  (:use :cl :fiveam :opencortex)
-  (:export #:emacs-edit-suite))
-
-(in-package :opencortex-emacs-edit-tests)
-
-(def-suite emacs-edit-suite
-  :description "Tests for Emacs Edit skill.")
-
-(in-suite emacs-edit-suite)
-
-(test id-generation
-  (let ((id1 (emacs-edit-generate-id))
-        (id2 (emacs-edit-generate-id)))
-    (is (plusp (length id1)))
-    (is (not (string= id1 id2))))) ;; Likely unique
-
-(test id-format
-  (let ((formatted (emacs-edit-id-format "abc12345")))
-    (is (search "id:" formatted))))
-
-(test property-setter
-  (let ((ast (list :type :headline
-                  :properties (list :ID "id:test123" :TITLE "Test")
-                  :contents nil)))
-    (emacs-edit-set-property ast "id:test123" :STATUS "ACTIVE")
-    (is (string= (getf (getf ast :properties) :STATUS) "ACTIVE"))))
-
-(test todo-setter
-  (let ((ast (list :type :headline
-                  :properties (list :ID "id:todo001" :TITLE "Task")
-                  :contents nil)))
-    (emacs-edit-set-todo ast "id:todo001" "DONE")
-    (is (string= (getf (getf ast :properties) :TODO) "DONE"))))