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/web-target/README.md

@@ -1,11 +1,11 @@
-# Clojure/Nim → JavaScript
+# Bara Lang → JavaScript
 
-Compile Clojure code to JavaScript via Nim's JS backend.
+Compile Bara Lang code to JavaScript via Nim's JS backend.
 
 ## Why?
 
-- **No JVM** — Clojure in the browser without 50MB runtime
-- **No JavaScript** — write Clojure, get JS
+- **No JVM** — Bara Lang in the browser without 50MB runtime
+- **No JavaScript** — write Bara Lang, get JS
 - **Smaller than ClojureScript** — no Google Closure compiler needed
 
 ## Quick Start