chore: rebrand Clojure/Nim → Bara Lang across codebase

- Bulk replace Clojure/Nim → Bara Lang in src/, lib/, examples/, benchmarks/,
  experiments/, books/, LICENSE, cljnim.nimble, PLAN.md, AI_AGENT.md
- Rename book chapters: 05-clojure-nim.md → 05-bara-lang.md (en + bg)
- Update all chapter index links and anchors
- Replace project-specific 'Clojure' references with 'Bara Lang' in
  experiments/, src/ai_assist.nim, src/tui_screens.nim, src/emitter.nim,
  src/reader.nim, src/types.nim, lib/cljnim_runtime*.nim
- Keep legitimate JVM Clojure/ClojureScript/Clojure CLR references intact

experiments/wasm-target/README.md

@@ -1,6 +1,6 @@
-# Clojure/Nim → WASM (via Emscripten)
+# Bara Lang → WASM (via Emscripten)
 
-Compile Clojure code to WebAssembly using Nim's Emscripten backend.
+Compile Bara Lang code to WebAssembly using Nim's Emscripten backend.
 
 ## Why?
 
@@ -31,7 +31,7 @@ Then open `www/index.html` in a browser.
 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
+4. JS calls `_wasmSquare(7)` → WASM executes native Bara Lang code
 
 ## Future