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.

skills/org-skill-peripheral-vision.org

@@ -37,7 +37,7 @@ Move context pruning and rendering logic out of `context.lisp` to allow for more
 
 ** 2. Semantic Interfaces
 
-#+begin_src lisp :tangle ./org-skill-peripheral-vision.lisp
+#+begin_src lisp :tangle (expand-file-name "org-skill-peripheral-vision.lisp" (concat (or (getenv "INSTALL_DIR") ".") "/skills"))
 (defun context-render-to-org (obj &key depth foveal-id semantic-threshold foveal-vector)
   "Recursively renders an org-object with foveal-peripheral pruning.")
 
@@ -48,7 +48,7 @@ Move context pruning and rendering logic out of `context.lisp` to allow for more
 * Phase D: Build (Implementation)
 
 ** Foveal-Peripheral Pruning
-#+begin_src lisp :tangle ./org-skill-peripheral-vision.lisp
+#+begin_src lisp :tangle (expand-file-name "org-skill-peripheral-vision.lisp" (concat (or (getenv "INSTALL_DIR") ".") "/skills"))
 
 (defun context-render-to-org (obj &key (depth 1) (foveal-id nil) (semantic-threshold 0.75) (foveal-vector nil))
   "Recursively renders an org-object and its children to an Org string using a Foveal-Peripheral Hybrid model."
@@ -112,7 +112,7 @@ Move context pruning and rendering logic out of `context.lisp` to allow for more
 #+end_src
 
 * Registration
-#+begin_src lisp :tangle ./org-skill-peripheral-vision.lisp
+#+begin_src lisp :tangle (expand-file-name "org-skill-peripheral-vision.lisp" (concat (or (getenv "INSTALL_DIR") ".") "/skills"))
 (defskill :skill-peripheral-vision
   :priority 90
   :dependencies ("org-skill-embedding")