feat(version): add version command to display version and build date

Makefile

@@ -14,6 +14,11 @@ GOGET=$(GOCMD) get
 GOMOD=$(GOCMD) mod
 GOCLEAN=$(GOCMD) clean
 
+# Version information
+VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+BUILD_DATE := $(shell date -u +"%Y-%m-%d %H:%M:%S UTC")
+LDFLAGS := -X 'main.version=$(VERSION)' -X 'main.buildDate=$(BUILD_DATE)'
+
 # Auto-detect container runtime (Docker or Podman)
 CONTAINER_RUNTIME := $(shell \
 	if command -v podman > /dev/null 2>&1; then \
@@ -37,9 +42,9 @@ COMPOSE_CMD := $(shell \
 all: lint test build ## Run linting, tests, and build
 
 build: deps ## Build the binary
-	@echo "Building $(BINARY_NAME)..."
+	@echo "Building $(BINARY_NAME) $(VERSION)..."
 	@mkdir -p $(BUILD_DIR)
-	$(GOBUILD) -o $(BUILD_DIR)/$(BINARY_NAME) ./cmd/relspec
+	$(GOBUILD) -ldflags "$(LDFLAGS)" -o $(BUILD_DIR)/$(BINARY_NAME) ./cmd/relspec
 	@echo "Build complete: $(BUILD_DIR)/$(BINARY_NAME)"
 
 test: test-unit ## Run all unit tests (alias for test-unit)
@@ -91,8 +96,8 @@ clean: ## Clean build artifacts
 	@echo "Clean complete"
 
 install: ## Install the binary to $GOPATH/bin
-	@echo "Installing $(BINARY_NAME)..."
-	$(GOCMD) install ./cmd/relspec
+	@echo "Installing $(BINARY_NAME) $(VERSION)..."
+	$(GOCMD) install -ldflags "$(LDFLAGS)" ./cmd/relspec
 	@echo "Install complete"
 
 deps: ## Download dependencies