Seed from go-template-repo, renamed to simplexcalc

The template's files at a77fd30, without its history or LICENSE, after
script/rename simplexcalc.

Model: opus-5-5

Makefile

@@ -0,0 +1,54 @@
+.PHONY: bootstrap setup test lint fmt fmt-check check build run dev deps docker cibuild clean hooks
+
+# Every target is a thin shim over script/. The scripts are the real
+# entrypoints: they carry the project-specific knowledge (flags,
+# timeouts, docker-only linting) that a raw `go test` or `golangci-lint`
+# invocation silently bypasses. Never call the underlying tools
+# directly.
+.DEFAULT_GOAL := check
+
+bootstrap:
+	@script/bootstrap
+
+setup:
+	@script/setup
+
+test:
+	@script/test
+
+lint:
+	@script/lint
+
+fmt:
+	@script/fmt
+
+fmt-check:
+	@script/fmt-check
+
+check:
+	@script/check
+
+build:
+	go build -o bin/simplexcalc ./cmd/simplexcalc
+
+run: build
+	./bin/simplexcalc serve
+
+dev:
+	go run ./cmd/simplexcalc serve
+
+deps:
+	go mod download
+	go mod tidy
+
+docker:
+	@script/docker
+
+cibuild:
+	@script/cibuild
+
+clean:
+	rm -rf bin/
+
+hooks:
+	@script/install-precommit