Add GitHub Actions CI/CD pipeline and test framework

- Add .github/workflows/build-test.yml for automated testing
- Add tests/ directory with TypeScript test runner
- Add docs/CICD.md documentation
- Remove .gitlab-ci.yml (migrated to GitHub Actions)
- Update .gitignore for test artifacts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -4,7 +4,8 @@
 .venv
 .swp
 dist
-build
+/build
+!tests/testcases/build
 .cache
 .gocache
 *.exe
@@ -16,3 +17,4 @@ llama/build
 llama/vendor
 /ollama
 docker/output/
+tests/node_modules/