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, 9 insertions, 0 deletions

diff --git a/internal/cli/cli.go b/internal/cli/cli.go
new file mode 100644
index 0000000..4b4e8c5
--- /dev/null
+++ b/internal/cli/cli.go
@@ -0,0 +1,9 @@
+// Package cli implements the command-line interface for geheim.
+// Run() is called by main and returns an exit code.
+package cli
+
+// Run is the top-level entry point for the CLI.
+// Returns 0 on success, non-zero on error.
+func Run() int {
+	return 0
+}