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

TASKS.md

@@ -101,6 +101,20 @@ These tasks are **small, well-defined, and high impact**:
 
 ---
 
+## Phase 10: AI Integration + Core Polish (9 May 2026)
+
+| ID | Task | Status | Complexity | Files | Acceptance Criteria |
+|---|---|---|---|---|---|
+| T10.1 | AI error messages — cache + full coverage | ✅ | 🟡 | `src/ai_assist.nim`, `src/cljnim.nim` | Error cache (50 entries, TTL 1h). ReaderError/EmitterError get AI explanations. |
+| T10.2 | AI code generation — eval builtin + REPL | ✅ | 🟡 | `src/eval.nim`, `src/repl.nim` | `(ai/generate "...")` in interpreter. `:ai`, `ai-generate` in all REPL modes. |
+| T10.3 | AI optimization hints | ✅ | 🟢 | `src/eval.nim`, `src/repl.nim` | `(ai/optimize "...")` in interpreter. `:optimize`, `ai-optimize` in all REPL modes. |
+| T10.4 | AI debugging — special form | ✅ | 🟡 | `src/eval.nim`, `src/repl.nim` | `(ai/debug expr)` as special form. `:debug`, `ai-debug` in all REPL modes. |
+| T10.5 | try/catch/finally — full implementation | ✅ | 🟡 | `src/emitter.nim`, `tests/test_emitter.nim` | Exception type respected. Binding is cljMap with :type/:message. 4 tests. |
+| T10.6 | Reader edge cases | ✅ | 🟢 | `src/reader.nim`, `tests/test_reader.nim` | `-.5`, `+.25`, `1e5`, `1.5e-3`, `-.5e-3`, `.25`. Scientific notation. 13 tests. |
+| T10.7 | CljVal type unification | ✅ | 🔴 | `src/types.nim`, `lib/cljnim_runtime.nim`, `src/runtime.nim`, `lib/cljnim_runtime_js.nim` | Identical CljKind enum (15 values) across all 4 files. All case statements cover new variants. |
+
+---
+
 ## How to claim a task
 
 1. Read this file