chore: scaffold Go project layout

.gitignore

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+# Binaries
+/bin/
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, output of `go test -c`
+*.test
+
+# Coverage
+*.out
+coverage.html
+
+# IDE
+.idea/
+.vscode/
+*.swp
+
+# Local env files
+.env
+.env.local

README.md

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+# package-updater
+
+Webhook-driven Docker Compose service updater. See [design spec](docs/superpowers/specs/2026-05-22-package-updater-design.md) for full design.
+
+## Quick start
+
+(TBD — filled in by final task)

cmd/server/main.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("package-updater (scaffold)")
+}

go.mod

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+module github.com/shcizo/package-updater
+
+go 1.26.3