Phase 1-4: Reader, Runtime, Macros, Nim Interop — 543x faster than JVM Clojure

- Reader: maps, sets, syntax-quote, dispatch macros, metadata
- Runtime: CljVal type system, 80+ core functions (collections, strings, math, IO)
- Emitter: full CljVal-based code generation, macro expansion, inline fns
- Macros: defmacro with compile-time evaluator, ->, ->>, and, or, when, cond, for, doseq
- Nim Interop: nim/module/function syntax, auto-import, type mapping
- CLI: cljnim -e '<code>' for quick evaluation
- Tests: 60 unit tests (reader + emitter)
- Benchmarks: AOT suite showing 543x startup, 679x factorial vs JVM Clojure
- CI: GitLab CI pipeline
- Runtime library: lib/cljnim_runtime.nim (1070+ lines)

examples/macros.clj

@@ -0,0 +1,33 @@
+; Macro test
+(println "=== Threading macros ===")
+
+; ->
+(println (-> 5 (+ 3) (* 2)))
+; => (* (+ 5 3) 2) = 16
+
+; ->>
+(println (->> [1 2 3] (map (fn [x] (* x x))) (reduce + 0)))
+; => 14
+
+(println "=== defmacro ===")
+
+(defmacro unless [condition & body]
+  (list 'if condition nil (cons 'do body)))
+
+(unless false
+  (println "unless works!"))
+
+(unless true
+  (println "this should NOT print"))
+
+(println "=== when macro ===")
+
+(when true
+  (println "when works!"))
+
+(println "=== and/or ===")
+
+(println (and true true))
+(println (and true false))
+(println (or false true))
+(println (or false false))