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/pipeline-reason-tests.lisp

@@ -1,26 +0,0 @@
-(defpackage :opencortex-pipeline-reason-tests
-  (:use :cl :fiveam :opencortex)
-  (:export #:pipeline-reason-suite))
-
-(in-package :opencortex-pipeline-reason-tests)
-
-(def-suite pipeline-reason-suite
-  :description "Test suite for Reason pipeline")
-
-(in-suite pipeline-reason-suite)
-
-(test test-decide-gate-safety
-  "Decide gate should block unsafe LLM proposals."
-  ;; Setup: clear skills and register mock
-  (clrhash opencortex::*skills-registry*)
-  (opencortex::defskill :mock-safety
-    :priority 50
-    :trigger (lambda (ctx) t)
-    :probabilistic (lambda (ctx) "Mock probabilistic")
-    :deterministic (lambda (action ctx)
-                (list :type :LOG :payload (list :text "Action rejected by skill heuristics"))))
-  (let* ((candidate (list :type :REQUEST :payload (list :action :eval :code "(shell-command \"rm -rf /\")")))
-         (signal (list :type :EVENT :candidate candidate))
-         (result (deterministic-verify candidate signal)))
-    (is (eq :LOG (getf result :type)))
-    (is (search "Action rejected by skill heuristics" (getf (getf result :payload) :text)))))