stats+log : am stats (agregats par agent, periodes 7d/30d/90d, barres ASCII) et am log (filtres agent/kind/date, limite) (issue #6)

src/repl.rs

@@ -61,6 +61,8 @@ const COMMAND_DESCRIPTIONS: &[(&str, &str)] = &[
     ("list", "list installed agents"),
     ("status", "show agent state"),
     ("sessions", "list agent sessions"),
+    ("stats", "usage statistics"),
+    ("log", "read the event journal"),
     ("search", "search the catalog"),
     ("info", "agent details"),
     ("install", "install an agent"),
@@ -137,7 +139,7 @@ impl AmCompleter {
         Self {
             theme: std::cell::Cell::new(crate::theme::default_theme()),
             commands: vec![
-                "list", "status", "sessions", "search", "info", "install", "uninstall", "update",
+                "list", "status", "sessions", "stats", "log", "search", "info", "install", "uninstall", "update",
                 "start", "stop", "restart", "run", "doctor", "config", "completion",
                 "self-update", "self-uninstall", "export", "import", "shell", "theme",
                 "ls", "dir", "cd", "ps", "where", "get", "help", "version", "exit",