Add Go project scaffold (task 352)

- go.mod with module codeberg.org/snonux/geheim (go 1.22, mage dep)
- Magefile.go with Build, Test, Install, Uninstall targets
- cmd/geheim/main.go delegating to internal/cli
- Stub packages: cli, version, config, crypto, git, store, clipboard, shell
- go.sum generated; binary confirmed to build via mage build

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/Magefile.go b/Magefile.go
new file mode 100644
index 0000000..ee80721
--- /dev/null
+++ b/Magefile.go
@@ -0,0 +1,59 @@
+//go:build mage
+
+// Magefile provides build targets for the geheim project.
+// Targets: Build, Test, Install, Uninstall
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/magefile/mage/mg"
+	"github.com/magefile/mage/sh"
+)
+
+const (
+	binary  = "./bin/geheim"
+	mainPkg = "./cmd/geheim"
+)
+
+// Build compiles the binary to ./bin/geheim.
+func Build() error {
+	mg.Deps(createBinDir)
+	fmt.Println("Building", binary)
+	return sh.RunV("go", "build", "-o", binary, mainPkg)
+}
+
+// Test runs all tests in the module.
+func Test() error {
+	fmt.Println("Running tests")
+	return sh.RunV("go", "test", "./...")
+}
+
+// Install builds the binary and copies it to ~/.local/bin/geheim.
+func Install() error {
+	mg.Deps(Build)
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("cannot determine home directory: %w", err)
+	}
+	dest := home + "/.local/bin/geheim"
+	fmt.Println("Installing to", dest)
+	return sh.Copy(dest, binary)
+}
+
+// Uninstall removes the installed binary from ~/.local/bin/geheim.
+func Uninstall() error {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("cannot determine home directory: %w", err)
+	}
+	dest := home + "/.local/bin/geheim"
+	fmt.Println("Uninstalling", dest)
+	return os.Remove(dest)
+}
+
+// createBinDir ensures ./bin exists before the build step writes the binary.
+func createBinDir() error {
+	return os.MkdirAll("./bin", 0755)
+}