feat: Prepare for code modularization and cleanup

- Archive old documentation and test files to `docs/archive/` and `local_tests/`.
- Remove various temporary and old files from the project root.
- Add `nekocode-rust` analysis tool and its output files (`nekocode/`, `.nekocode_sessions/`, `analysis.json`).
- Minor updates to `apps/chip8_nyash/chip8_emulator.nyash` and `local_tests` files.

This commit cleans up the repository and sets the stage for further code modularization efforts, particularly in the `src/interpreter` and `src/parser` modules, based on recent analysis.

local_tests/test_delegation_basic.nyash

@@ -0,0 +1,32 @@
+box Parent {
+    init { name }
+    
+    pack(n) {
+        me.name = n
+    }
+    
+    greet() {
+        return "Hello " + me.name
+    }
+}
+
+box Child from Parent {
+    init { age }
+    
+    pack(n, a) {
+        from Parent.pack(n)
+        me.age = a
+    }
+    
+    override greet() {
+        local base = from Parent.greet()
+        return base + " (age " + me.age + ")"
+    }
+}
+
+static box Main {
+    main() {
+        local c = new Child("Alice", 25)
+        return c.greet()
+    }
+}