build: add test and clean targets to Makefile

make test: builds then runs all three test suites (138 tests).
make clean: removes build, build-debug, build-release directories.

Finishing off 0.2.

Makefile

@@ -5,6 +5,8 @@
 #   debug        — Debug build (build-debug/)
 #   release      - Release build (build-release/)
 #   dist         - tar.zst tarball of the release build (requires zstd)
+#   test         — build then run all three test suites
+#   clean        - remove all build directories
 #   dist-clean   - remove everything under dist/
 #
 # Overridable: make release CXX=g++ GENERATOR="Unix Makefiles"
@@ -25,7 +27,7 @@ DIST_NAME  := kappa-$(GIT_COMMIT)-$(GIT_TAG)-$(STAMP)
 
 CMAKE := cmake
 
-.PHONY: build debug release dist dist-clean
+.PHONY: build debug release dist test clean dist-clean
 
 build:
 	$(CMAKE) -S . -B $(BUILD_DIR) -G $(GENERATOR) \
@@ -53,3 +55,18 @@ dist: release
 
 dist-clean:
 	rm -rf $(DIST_DIR)
+
+test: build
+	@echo "==> test.sh"
+	@./test.sh
+	@echo ""
+	@echo "==> test-init-switch.sh"
+	@./test-init-switch.sh
+	@echo ""
+	@echo "==> test-full.sh"
+	@./test-full.sh
+	@echo ""
+	@echo "all test suites passed"
+
+clean:
+	rm -rf $(BUILD_DIR) $(DEBUG_DIR) $(RELEASE_DIR)