test(tui): match empty-session snapshot to welcome copy

The home harness still required the substring Cortex CLI, which the
two-line splash no longer contains.

Co-authored-by: Mathis <echobt@users.noreply.github.com>

Author: cursoragent

src/cortex-tui/src/views/minimal_session/tests.rs

@@ -45,9 +45,13 @@ mod harness_snapshots {
         dump_snapshot("home", &text);
         assert!(!text.to_lowercase().contains("grok"));
         assert!(
-            text.contains("Cortex CLI"),
+            text.contains("Welcome to") && text.contains("the coding agent CLI"),
             "home session should render splash: {text}"
         );
+        assert!(
+            text.contains("/ commands"),
+            "home session should render keystroke hints: {text}"
+        );
         assert!(
             !text.contains("Directory") && !text.contains("Computer"),
             "home session must not show header cards: {text}"