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

README.md

@@ -27,6 +27,7 @@ make check
 
 - **[English](docs/en/index.md)** — Getting started, architecture, AI integration, API reference
 - **[Български](docs/bg/index.md)** — Първи стъпки, архитектура, AI интеграция, API справочник
+- **[Clojure Test Suite](docs/en/07-clojure-test-suite.md)** — Cross-dialect compliance testing with the [jank-lang/clojure-test-suite](https://github.com/jank-lang/clojure-test-suite)
 
 ## What is this?