fix(cli): improve --search flag help text to explain capabilities

Fixes bounty issue #1427

The help text for the --search flag was too brief, only saying 'Enable web
search' without explaining what search capabilities the agent gains. Updated
the description to clarify that this enables the agent to find information
online and cite relevant results.

Author: factorydroid

cortex-cli/src/main.rs

@@ -98,7 +98,7 @@ struct InteractiveArgs {
     #[arg(long = "cd", short = 'C', value_name = "DIR")]
     cwd: Option<PathBuf>,
 
-    /// Enable web search
+    /// Enable web search for the agent to find information online (returns relevant results that can be cited)
     #[arg(long = "search", default_value_t = false)]
     web_search: bool,