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.

state/memory-image.lisp

@@ -0,0 +1,16 @@
+(in-package :opencortex)
+
+(SETF (GETHASH "fake-hash-123" *HISTORY-STORE*)
+        #S(ORG-OBJECT
+           :ID "persist-test-1"
+           :TYPE NIL
+           :ATTRIBUTES NIL
+           :CONTENT "Integrity Check"
+           :VECTOR NIL
+           :PARENT-ID NIL
+           :CHILDREN NIL
+           :VERSION NIL
+           :LAST-SYNC NIL
+           :HASH "fake-hash-123")) 
+(SETF (GETHASH "persist-test-1" *MEMORY*)
+        (GETHASH "fake-hash-123" *HISTORY-STORE*))