feat(cli): authforgectl subcommand structure with clap derive (Task C1)

cli/src/commands/mod.rs

@@ -0,0 +1,7 @@
+use anyhow::Result;
+
+pub(crate) async fn dispatch(_json: bool, cmd: super::Cmd) -> Result<()> {
+    eprintln!("authforgectl: subcommand dispatcher not yet wired in this build");
+    let _ = cmd;
+    Ok(())
+}