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

benchmarks/run_aot_benchmarks.sh

@@ -31,7 +31,7 @@ run_aot_bench() {
   echo ""
   
   # Pre-compiled native binary
-  echo "  [Clojure/Nim AOT]"
+  echo "  [Bara Lang AOT]"
   local nim_total=0
   local nim_times=()
   for ((i=1; i<=runs; i++)); do
@@ -71,7 +71,7 @@ run_aot_bench() {
     
     if [ $nim_avg -gt 0 ]; then
       local speedup=$((jvm_avg / nim_avg))
-      echo "  => Clojure/Nim AOT is ${speedup}x FASTER (avg)"
+      echo "  => Bara Lang AOT is ${speedup}x FASTER (avg)"
     fi
   else
     echo "  [JVM Clojure] — not installed"