feat(cli): sessions command + 'did you mean' suggestions + honest tab-switch liveness (#29)

- chrome-use sessions: top-level alias for the daemon inventory (the skill
  advertises sessions, so it's a natural guess that used to error).
- Unknown commands now suggest the nearest valid one (Levenshtein + prefix
  match), staying silent when nothing is close (e.g. 'clik' -> click,
  'sesions' -> sessions, 'xyzzy' -> no suggestion).
- tab <id>: probe the switched session and show a warning indicator instead of
  a green check when it isn't responding yet, so a switch onto a re-attaching
  (churned-tabId) session no longer reports false success. The #24 targetId
  recovery self-heals within ~6s, hence a warning rather than a hard error.

cli/src/main.rs

@@ -893,6 +893,14 @@ fn main() {
         return;
     }
 
+    // `sessions` is a natural top-level guess for "list my sessions" (the skill
+    // advertises sessions as a feature) — route it to the daemon inventory the
+    // same way `daemon status` does (issue #29).
+    if clean.first().map(|s| s.as_str()) == Some("sessions") {
+        run_daemon(&["sessions".to_string(), "status".to_string()], flags.json);
+        return;
+    }
+
     // Handle close --all: close all active sessions
     if matches!(
         clean.first().map(|s| s.as_str()),