feat: Initialize compiler GUI project

Sets up the basic structure for the compiler GUI application using
eframe.
This includes the main application loop, a default UI layout with a
source code editor and an output log panel, and the foundational AST
(Abstract Syntax Tree) definitions for types, nodes, and an evaluation
mechanism.

.gemini/settings.json

@@ -0,0 +1,7 @@
+{
+  "context": {
+    "fileFiltering": {
+      "respectGitIgnore": false
+    }
+  }
+}