fix(commands): surface limits and web toggles

Acceptance-Criteria:
- Command palette suggestions include limits/web management commands
- Help overlay documents :limits and :web on|off|status controls

Test-Notes:
- cargo test -p owlen-tui
- cargo clippy -p owlen-tui --tests -- -D warnings

crates/owlen-tui/src/commands/mod.rs

@@ -183,6 +183,22 @@ const COMMANDS: &[CommandSpec] = &[
         keyword: "markdown",
         description: "Toggle markdown rendering",
     },
+    CommandSpec {
+        keyword: "limits",
+        description: "Show hourly/weekly usage totals",
+    },
+    CommandSpec {
+        keyword: "web on",
+        description: "Enable web search tool exposure",
+    },
+    CommandSpec {
+        keyword: "web off",
+        description: "Disable web search tool exposure",
+    },
+    CommandSpec {
+        keyword: "web status",
+        description: "Show current web search tool state",
+    },
     CommandSpec {
         keyword: "e",
         description: "Edit a file",
@@ -336,6 +352,22 @@ mod tests {
         assert_eq!(results[0].keyword, "agent start");
         assert!(results.iter().any(|spec| spec.keyword == "agent stop"));
     }
+
+    #[test]
+    fn suggestions_include_limits_command() {
+        let results = suggestions("li");
+        assert!(!results.is_empty());
+        assert_eq!(results[0].keyword, "limits");
+        assert!(results.iter().any(|spec| spec.keyword == "limits"));
+    }
+
+    #[test]
+    fn suggestions_include_web_variants() {
+        let results = suggestions("web");
+        assert!(results.iter().any(|spec| spec.keyword == "web on"));
+        assert!(results.iter().any(|spec| spec.keyword == "web off"));
+        assert!(results.iter().any(|spec| spec.keyword == "web status"));
+    }
 }
 
 fn is_subsequence(text: &str, pattern: &str) -> bool {

crates/owlen-tui/src/ui.rs

@@ -4237,7 +4237,8 @@ fn render_help(frame: &mut Frame<'_>, app: &ChatApp) {
             Line::from("  :provider <name> [auto|local|cloud] → switch provider or set mode"),
             Line::from("  :models --local | --cloud → focus models by scope"),
             Line::from("  :cloud setup [--force-cloud-base-url] → configure Ollama Cloud"),
-            Line::from("  :web on|off      → expose or hide the web.search tool"),
+            Line::from("  :web on|off|status → manage web.search availability"),
+            Line::from("  :limits           → show hourly/weekly usage totals"),
             Line::from(""),
             Line::from(vec![Span::styled(
                 "SESSION MANAGEMENT",