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/native-lib/README.md

@@ -1,12 +1,12 @@
-# Clojure/Nim → Native Shared Library
+# Bara Lang → Native Shared Library
 
-Compile Clojure code to a C shared library (`.so` / `.dll` / `.dylib`).
+Compile Bara Lang code to a C shared library (`.so` / `.dll` / `.dylib`).
 
 ## Why?
 
-- **Embed Clojure in Python/Rust/Go/C** via FFI
+- **Embed Bara Lang in Python/Rust/Go/C** via FFI
 - **Tiny binaries** — no JVM overhead
-- **True C ABI** — call Clojure functions from any language
+- **True C ABI** — call Bara Lang functions from any language
 
 ## Quick Start