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)

.gitlab-ci.yml

@@ -0,0 +1,32 @@
+image: nimlang/nim:2.0.0
+
+stages:
+  - test
+  - build
+
+test:
+  stage: test
+  script:
+    - nim c -o:cljnim src/cljnim.nim
+    - nim c -r tests/test_reader.nim
+    - nim c -r tests/test_emitter.nim
+    - ./cljnim compile examples/hello.clj /tmp/hello.nim
+    - nim c -r /tmp/hello.nim
+    - ./cljnim compile examples/math.clj /tmp/math.nim
+    - nim c -r /tmp/math.nim
+  artifacts:
+    paths:
+      - cljnim
+    expire_in: 1 week
+
+build-release:
+  stage: build
+  only:
+    - main
+  script:
+    - nim c -d:release -o:cljnim src/cljnim.nim
+    - nim c -d:release -o:/tmp/bench_hello.nim
+  artifacts:
+    paths:
+      - cljnim
+    expire_in: 1 month