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/wasm-target/README.md

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+# Clojure/Nim → WASM (via Emscripten)
+
+Compile Clojure code to WebAssembly using Nim's Emscripten backend.
+
+## Why?
+
+- **Native speed in browser** — no JS interpreter overhead
+- **Smaller than JVM** — WASM module is ~100KB vs 50MB+ JVM
+- **Secure sandbox** — WASM runs in browser's security model
+
+## Requirements
+
+```bash
+git clone https://github.com/emscripten-core/emsdk.git
+cd emsdk
+./emsdk install latest
+./emsdk activate latest
+source ./emsdk_env.sh
+```
+
+## 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. `nim c -d:emscripten` — compiles Nim to WASM + JS glue
+3. Browser loads `math.js` (glue) + `math.wasm` (WASM module)
+4. JS calls `_wasmSquare(7)` → WASM executes native Clojure code
+
+## Future
+
+- WASI target (server-side WASM)
+- wasm32-wasi-musl via Zig (no Emscripten needed)
+- DOM interop through Emscripten bindings