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-perceive-tests.lisp

@@ -1,23 +0,0 @@
-(defpackage :opencortex-pipeline-perceive-tests
-  (:use :cl :fiveam :opencortex)
-  (:export #:pipeline-perceive-suite))
-
-(in-package :opencortex-pipeline-perceive-tests)
-
-(def-suite pipeline-perceive-suite
-  :description "Test suite for Perceive pipeline")
-
-(in-suite pipeline-perceive-suite)
-
-(test test-perceive-gate
-  "Perceive gate should update the object store and normalize signal."
-  (clrhash opencortex::*memory*)
-  (let* ((signal (list :type :EVENT :payload (list :sensor :buffer-update :ast (list :type :HEADLINE :properties (list :ID "test-node" :TITLE "Test") :contents nil))))
-         (result (perceive-gate signal)))
-    (is (eq :perceived (getf result :status)))
-    (is (not (null (gethash "test-node" opencortex::*memory*))))))
-
-(test test-depth-limiting
-  "Verify that the pipeline terminates runaway feedback loops."
-  (let ((runaway-signal (list :type :EVENT :depth 11 :payload (list :sensor :heartbeat))))
-    (is (null (process-signal runaway-signal)))))