fix: general equality (=) for all types, add type predicates & collection fns, test suite docs

- Fix: = now uses cljEqual/cljMultiEqual instead of numeric-only cljNumEq,
  so (= :a :a), (= "a" "a"), (= [1 2] [1 2]), (= nil nil) etc return true
- Fix: ns forms inside unwrapped (do ...) are skipped instead of emitting
  broken Nim comments inside cljRepr()
- Fix: defmacro forms go to defs section, not wrapped in discard cljRepr()
- Add 18 type predicates: keyword?, symbol?, string?, number?, integer?,
  float?, vector?, map?, set?, list?, seq?, coll?, sequential?, fn?,
  boolean?, true?, false?, some?
- Add collection fns: second, ffirst, nfirst, peek, pop
- Add keyword/symbol ops: keyword, symbol, name, namespace, key, val
- Update eval interpreter = to handle structural collection equality
- Add test_single.py + test_vals.clj for Clojure test suite runner
- Add docs/en/07 and docs/bg/07 for cross-dialect test suite compatibility
- Update README with test suite documentation link

tests/test_emitter.nim

@@ -143,7 +143,7 @@ suite "Emitter - Operators":
   test "emit equality":
     let v = read("(= 1 1)")
     let code = emitExpr(v)
-    check "cljNumEq" in code
+    check "cljMultiEqual" in code
 
   test "emit not=":
     let v = read("(not= 1 2)")