chore: add Makefile with build, test, lint, check, run targets

Makefile

@@ -0,0 +1,36 @@
+BINARY  := bin/llmtest
+CONFIG  ?= config.yaml
+FLAGS   ?=
+
+.PHONY: all build test lint check run list clean
+
+all: build
+
+## build: compile the CLI into bin/llmtest
+build:
+	go build -o $(BINARY) ./cmd/llmtest
+
+## test: run the full offline test suite with the race detector
+test:
+	go test -race ./...
+
+## lint: the static-analysis gate (format, vet, golangci-lint, gosec)
+lint:
+	@test -z "$$(gofmt -l . | grep -v '^\.claude/')" || { gofmt -l . | grep -v '^\.claude/'; echo "gofmt: files need formatting"; exit 1; }
+	go vet ./...
+	golangci-lint run
+	gosec -quiet -tests ./...
+
+## check: everything CI would run — build, lint, tests
+check: build lint test
+
+## run: execute the benchmark (make run CONFIG=config.yaml FLAGS="--models uni/btl-4")
+run: build
+	./$(BINARY) run --config $(CONFIG) $(FLAGS)
+
+## list: print the test catalog
+list: build
+	./$(BINARY) list
+
+clean:
+	rm -rf bin