feat(cli): add advanced command hint to help output

Add a hint at the bottom of `azldev --help` pointing users to the hidden
`advanced` command group, which contains essential tools (mock, mcp, wget).
This improves discoverability without fully unhiding the advanced commands.

Closes #33

Author: Kelvinoppong

internal/app/azldev/app.go

@@ -155,6 +155,7 @@ lives), or use -C to point to one.`,
 
 	app.cmd.SetHelpCommandGroupID(CommandGroupMeta)
 	app.cmd.SetCompletionCommandGroupID(CommandGroupMeta)
+	app.addAdvancedCommandHint()
 
 	// Define global flags and configuration settings.
 	app.cmd.PersistentFlags().BoolVarP(&app.verbose, "verbose", "v", false, "enable verbose output")
@@ -179,6 +180,20 @@ lives), or use -C to point to one.`,
 	return app
 }
 
+// addAdvancedCommandHint customizes the root help output to include a hint about
+// the hidden "advanced" command group.
+func (a *App) addAdvancedCommandHint() {
+	defaultHelp := a.cmd.HelpFunc()
+	a.cmd.SetHelpFunc(func(cmd *cobra.Command, args []string) {
+		defaultHelp(cmd, args)
+
+		if cmd == cmd.Root() {
+			fmt.Fprintln(cmd.OutOrStdout(),
+				`Use "azldev advanced --help" for additional tools (mock, mcp, wget).`)
+		}
+	})
+}
+
 // Returns the names of the app's commands. The optional provided list of ancestors
 // instructs this function to traverse through the command hierarchy before retrieving
 // child names. This function is largely intended for tests to introspect on the

scenario/__snapshots__/TestSnapshotsContainer_--help_stdout_1.snap

@@ -39,3 +39,5 @@ Flags:
 
 Use "azldev [command] --help" for more information about a command.
 
+Use "azldev advanced --help" for additional tools (mock, mcp, wget).
+

scenario/__snapshots__/TestSnapshotsContainer_help_stdout_1.snap

@@ -39,3 +39,5 @@ Flags:
 
 Use "azldev [command] --help" for more information about a command.
 
+Use "azldev advanced --help" for additional tools (mock, mcp, wget).
+

scenario/__snapshots__/TestSnapshots_--help_stdout_1.snap

@@ -39,3 +39,5 @@ Flags:
 
 Use "azldev [command] --help" for more information about a command.
 
+Use "azldev advanced --help" for additional tools (mock, mcp, wget).
+

scenario/__snapshots__/TestSnapshots_--help_with_color_stdout_1.snap

@@ -39,3 +39,4 @@ Meta commands:
 
 Use "azldev [command] --help" for more information about a command.
 
+Use "azldev advanced --help" for additional tools (mock, mcp, wget).

scenario/__snapshots__/TestSnapshots_help_stdout_1.snap

@@ -39,3 +39,5 @@ Flags:
 
 Use "azldev [command] --help" for more information about a command.
 
+Use "azldev advanced --help" for additional tools (mock, mcp, wget).
+