refactor: split check into check-fmt, lint, test targets

make check now depends on check-fmt, lint, and test as prerequisites,
each runnable independently.

Makefile

@@ -13,7 +13,7 @@ GOLDFLAGS += -X main.Version=$(VERSION)
 GOLDFLAGS += -X main.Gitrev=$(GITREV_BUILD)
 GOFLAGS := -ldflags "$(GOLDFLAGS)"
 
-.PHONY: docker default run ci test fixme
+.PHONY: docker default run ci test fixme check check-fmt lint
 
 default: fmt test
 
@@ -51,9 +51,8 @@ fmt: mfer/mf.pb.go
 	-prettier -w *.json
 	-prettier -w *.md
 
-lint:
-	golangci-lint run
-	sh -c 'test -z "$$(gofmt -l .)"'
+lint: mfer/mf.pb.go
+	golangci-lint run ./...
 
 docker: sneak-mfer.$(ARCH).tzst.dockerimage
 
@@ -80,11 +79,10 @@ modcache.tzst: go.mod go.sum
 	cd $(shell go env GOMODCACHE) && tar -c . | pv | zstdmt -19 > $(PWD)/$@.tmp
 	mv $@.tmp $@
 
-# Run all checks (formatting, linting, tests) without modifying files
-check:
+# Individual check targets
+check-fmt:
 	@echo "==> Checking formatting..."
 	@test -z "$$(gofmt -l .)" || (echo "Files not formatted:" && gofmt -l . && exit 1)
-	@echo "==> Running linter..."
-	golangci-lint run ./...
-	@echo "==> Running tests..."
-	go test -race -timeout 30s ./...
+
+# Run all checks (formatting, linting, tests) without modifying files
+check: check-fmt lint test