chore: add initial project scaffolding with CI, build system, and core source files

Makefile

@@ -0,0 +1,38 @@
+CC = gcc
+CFLAGS = -std=c11 -Wall -Wextra -O2
+LDFLAGS = -lpthread
+
+TARGET = example
+LOADTEST = loadtest
+SOURCES = celerityapi.c example.c
+HEADERS = celerityapi.h
+
+.PHONY: all clean run debug test
+
+all: $(TARGET) $(LOADTEST)
+
+$(TARGET): $(SOURCES) $(HEADERS)
+	$(CC) $(CFLAGS) -o $(TARGET) $(SOURCES) $(LDFLAGS)
+
+$(LOADTEST): loadtest.c
+	$(CC) $(CFLAGS) -o $(LOADTEST) loadtest.c $(LDFLAGS) -lm
+
+debug: CFLAGS += -g -DDEBUG
+debug: clean all
+
+clean:
+	rm -f $(TARGET) $(LOADTEST)
+
+run: $(TARGET)
+	./$(TARGET)
+
+test: $(TARGET) $(LOADTEST)
+	@echo "Starting server..."
+	@./$(TARGET) --port 9000 &
+	@sleep 2
+	@echo "Running load test..."
+	@./$(LOADTEST) -c 50 -d 5 http://127.0.0.1:9000/health
+	@pkill -f "./$(TARGET) --port 9000" || true
+
+valgrind: debug
+	valgrind --leak-check=full --show-leak-kinds=all ./$(TARGET)