Improve init closing message with one-shot agent commands

Say 'AppHost created' instead of 'skeleton created', and print
copy-pasteable commands for GitHub Copilot, Claude Code, and OpenCode
to invoke the aspire-init skill.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: maddymontaquila

src/Aspire.Cli/Commands/InitCommand.cs

@@ -91,10 +91,13 @@ protected override async Task<int> ExecuteAsync(ParseResult parseResult, Cancell
         var workspaceRoot = solutionFile?.Directory ?? workingDirectory;
         var agentInitResult = await _agentInitCommand.PromptAndChainAsync(_hostEnvironment, InteractionService, ExitCodeConstants.Success, workspaceRoot, cancellationToken);
 
-        // Step 5: Print closing message.
+        // Step 5: Print closing message with one-shot agent commands.
         InteractionService.DisplayEmptyLine();
-        InteractionService.DisplayMessage(KnownEmojis.Sparkles, "Aspire skeleton created! Open your agent and ask it to complete setup.");
-        InteractionService.DisplaySubtleMessage("The aspire-init skill will guide your agent through wiring up projects, dependencies, and validation.");
+        InteractionService.DisplayMessage(KnownEmojis.Sparkles, "Aspire AppHost created! To complete setup, invoke the aspire-init skill with your agent:");
+        InteractionService.DisplayEmptyLine();
+        InteractionService.DisplaySubtleMessage("  GitHub Copilot:  copilot \"run the aspire-init skill\"");
+        InteractionService.DisplaySubtleMessage("  Claude Code:     claude \"run the aspire-init skill\"");
+        InteractionService.DisplaySubtleMessage("  OpenCode:        opencode \"run the aspire-init skill\"");
 
         return agentInitResult;
     }