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/web-target/README.md

@@ -0,0 +1,36 @@
+# Clojure/Nim → JavaScript
+
+Compile Clojure code to JavaScript via Nim's JS backend.
+
+## Why?
+
+- **No JVM** — Clojure in the browser without 50MB runtime
+- **No JavaScript** — write Clojure, get JS
+- **Smaller than ClojureScript** — no Google Closure compiler needed
+
+## Quick Start
+
+```bash
+./build.sh
+```
+
+Then open `www/index.html` in a browser.
+
+## How it works
+
+1. `cljnim compile-lib` — generates Nim with exported functions
+2. `js_wrappers.nim` — thin wrappers that convert CljVal ↔ JS types
+3. `nim js` — compiles Nim to JavaScript
+4. Browser loads `math.js` and calls `jsSquare(7)`, `jsFactorial(5)`, etc.
+
+## Limitations
+
+- Full `cljnim_runtime.nim` uses C FFI (threads, processes) — not JS-compatible
+- For now, only numeric and string functions work
+- Persistent data structures need JS-specific runtime
+
+## Future
+
+- Full JS runtime for HAMT vectors/maps
+- DOM interop: `(dom/getElementById "app")`
+- npm package output