build: dynamically tangle to INSTALL_DIR without copying .org files

- Updated all 150+ :tangle headers across harness/ and skills/ to use elisp (expand-file-name) to target INSTALL_DIR dynamically.
- Cleaned up environment/ directory depth by moving memory-image.lisp to state/.
- Moved test scripts to tests/ and deleted redundant chat scripts.

harness/tui-client.org

@@ -10,7 +10,7 @@
 The OpenCortex TUI Client is a standalone Common Lisp application built on **Croatoan**. It provides a real-time, multi-window interface for interacting with the OpenCortex daemon.
 
 * Implementation
-#+begin_src lisp :tangle ./tui-client.lisp
+#+begin_src lisp :tangle (expand-file-name "tui-client.lisp" (concat (or (getenv "INSTALL_DIR") ".") "/harness"))
 (in-package :cl-user)
 (defpackage :opencortex.tui
   (:use :cl :croatoan)