feat: add fullscreen TUI and project updates

- New TUI screens: Main Menu, Compile, Run, REPL, AI Generator, AI Settings, Help
- AI configuration persisted in ~/.config/cljnim/config.json
- Added illwill dependency for terminal UI
- Updated experiments, examples, docs, and core modules

experiments/native-lib/native_wrappers.nim

@@ -0,0 +1,23 @@
+# C-friendly wrappers around Clojure-generated code
+# Exports plain C types (int, char*) instead of CljVal
+
+import cljnim_runtime
+
+# Import the generated Clojure functions
+include build/math
+
+proc c_square*(x: cint): cint {.exportc, dynlib.} =
+  let r = square(cljInt(x.int64))
+  return r.intVal.cint
+
+proc c_factorial*(n: cint): cint {.exportc, dynlib.} =
+  let r = factorial(cljInt(n.int64))
+  return r.intVal.cint
+
+proc c_add*(a, b: cint): cint {.exportc, dynlib.} =
+  let r = add(cljInt(a.int64), cljInt(b.int64))
+  return r.intVal.cint
+
+proc c_greet*(name: cstring): cstring {.exportc, dynlib.} =
+  let r = greet(cljString($name))
+  return r.strVal.cstring