Document WithCommand return-value payloads (Text/Json/Markdown) for Aspire 13.3

src/frontend/src/content/docs/dashboard/explore.mdx

@@ -579,13 +579,17 @@ Selecting **View response** opens the text visualizer with the command's result
 
 <Image src={notificationCenterResponse} alt="Aspire dashboard text visualizer showing a command response opened from the notification center." />
 
+<Aside type="note">
+Markdown command results render as formatted Markdown in the text visualizer (for example, headings and tables), not as raw Markdown source.
+</Aside>
+
 The unread count resets when you open the notification center. To clear all notifications, select the **Dismiss all** button in the dialog.
 
 <Aside type="tip">
 Notifications are capped at 100 entries. When the limit is reached, the oldest notifications are removed automatically.
 </Aside>
 
-For information on returning messages from custom commands, see [Custom resource commands](/fundamentals/custom-resource-commands/).
+For information on returning command result payloads from custom commands, see [Custom resource commands](/fundamentals/custom-resource-commands/).
 
 ## Settings dialog
 

src/frontend/src/content/docs/fundamentals/custom-resource-commands.mdx

@@ -629,7 +629,7 @@ The `ExecuteCommandResult` type carries the outcome of a command. It exposes the
 - **`Success` / `success`** _(boolean)_ — Whether the command completed successfully.
 - **`Canceled` / `canceled`** _(boolean)_ — Whether the command was canceled by the user.
 - **`Message` / `message`** _(string?)_ — A human-readable message that surfaces in the dashboard [notification center](/dashboard/explore/#notification-center) and CLI output. Used for both success messages and error messages.
-- **`Data` / `data`** _(`CommandResultData?`)_ — Optional structured output (plain text, JSON, or Markdown). See [Return structured output from a command](#return-structured-output-from-a-command).
+- **`Data` / `data`** _(`CommandResultData?`)_ — Optional structured output (plain text, JSON, or Markdown). See [Return a result from a command](#return-a-result-from-a-command).
 
 <Aside type="note">
 A separate `ErrorMessage` property exists for backward compatibility but is deprecated. New code should set `Message` (`message` in TypeScript) — it covers both successful and unsuccessful outcomes.
@@ -676,7 +676,9 @@ return { success: false, message: err instanceof Error ? err.message : String(er
 </TabItem>
 </Tabs>
 
-## Return structured output from a command
+<span id="return-structured-output-from-a-command"></span>
+
+## Return a result from a command
 
 Resource commands can return a structured payload — plain text, JSON, or Markdown — alongside the success/failure signal. The payload flows automatically through the entire Aspire pipeline:
 
@@ -826,6 +828,105 @@ await builder.build().run();
 </TabItem>
 </Tabs>
 
+### Return Markdown
+
+When a command needs rich output (for example headings, tables, and lists), use the `CommandResults.Success(string, CommandResultData)` overload to return a `CommandResultData` with `Format = CommandResultFormat.Markdown`. This alternative to the three-parameter string overload gives you full control over the result payload:
+
+<Tabs syncKey="aspire-lang">
+<TabItem id="csharp" label="C#">
+
+```csharp title="C# — AppHost.cs"
+using Aspire.Hosting.ApplicationModel;
+
+var builder = DistributedApplication.CreateBuilder(args);
+
+builder.AddProject<Projects.MyService>("myservice")
+    .WithCommand(
+        name: "migrate-database",
+        displayName: "Migrate Database",
+        executeCommand: _ =>
+        {
+            var markdown = """
+                # ⚙️ Database Migration Summary
+
+                | Table      | Result                     |
+                |------------|----------------------------|
+                | Customers  | ✅ 1,200 rows              |
+                | Products   | ✅ 850 rows                |
+                | Orders     | ✅ 3,400 rows              |
+                | OrderItems | ✅ 8,750 rows              |
+                | Categories | ✅ 45 rows                 |
+                | Reviews    | ❌ FK constraint violation |
+                | Inventory  | ✅ 850 rows                |
+                | Shipping   | ✅ 3,400 rows              |
+                | Payments   | ❌ Timeout after 30s       |
+                | Coupons    | ✅ 120 rows                |
+
+                **Summary:** 8 of 10 tables migrated successfully. 2 tables failed.
+                """;
+
+            return Task.FromResult(CommandResults.Success(
+                "Database migrated.",
+                new CommandResultData
+                {
+                    Value = markdown,
+                    Format = CommandResultFormat.Markdown,
+                }));
+        });
+
+builder.Build().Run();
+```
+
+</TabItem>
+<TabItem id="typescript" label="TypeScript">
+
+```typescript title="TypeScript — apphost.mts"
+import {
+    createBuilder,
+    CommandResultFormat,
+    type ExecuteCommandContext,
+    type ExecuteCommandResult,
+} from './.aspire/modules/aspire.mjs';
+
+const builder = await createBuilder();
+
+await builder
+    .addNodeApp("myservice", "./myservice", "src/server.ts")
+    .withCommand("migrate-database", "Migrate Database",
+        async (_context: ExecuteCommandContext): Promise<ExecuteCommandResult> => {
+            const markdown = `# ⚙️ Database Migration Summary
+
+| Table      | Result                     |
+|------------|----------------------------|
+| Customers  | ✅ 1,200 rows              |
+| Products   | ✅ 850 rows                |
+| Orders     | ✅ 3,400 rows              |
+| OrderItems | ✅ 8,750 rows              |
+| Categories | ✅ 45 rows                 |
+| Reviews    | ❌ FK constraint violation |
+| Inventory  | ✅ 850 rows                |
+| Shipping   | ✅ 3,400 rows              |
+| Payments   | ❌ Timeout after 30s       |
+| Coupons    | ✅ 120 rows                |
+
+**Summary:** 8 of 10 tables migrated successfully. 2 tables failed.`;
+
+            return {
+                success: true,
+                message: "Database migrated.",
+                data: {
+                    value: markdown,
+                    format: CommandResultFormat.Markdown,
+                },
+            };
+        });
+
+await builder.build().run();
+```
+
+</TabItem>
+</Tabs>
+
 ### Choose a result format
 
 `CommandResultFormat` has three values:

src/frontend/src/content/docs/fundamentals/http-commands.mdx

@@ -137,7 +137,7 @@ The preceding code:
 
 ## Return the HTTP response body
 
-By default, an HTTP command uses the HTTP status code to determine whether the command succeeded, and it doesn't return the response body as command result data. Set `HttpCommandOptions.ResultMode` to opt in to returning a non-empty response body from the endpoint. The body is surfaced as the command's structured output, just like [structured output from custom resource commands](/fundamentals/custom-resource-commands/#return-structured-output-from-a-command).
+By default, an HTTP command uses the HTTP status code to determine whether the command succeeded, and it doesn't return the response body as command result data. Set `HttpCommandOptions.ResultMode` to opt in to returning a non-empty response body from the endpoint. The body is surfaced as the command's structured output, just like [structured output from custom resource commands](/fundamentals/custom-resource-commands/#return-a-result-from-a-command).
 
 The following example configures an HTTP command that returns a JSON response body:
 

src/frontend/src/content/docs/whats-new/aspire-13-3.mdx

@@ -521,7 +521,7 @@ await builder.build().run();
 
 ### Resource commands return structured results
 
-Custom resource commands can now return an `ExecuteCommandResult` with a structured `Message` payload that the dashboard renders in the notification center. The new `Logger` property on `ExecuteCommandContext` lets command implementations log directly to the resource's log stream.
+Custom resource commands can now return an `ExecuteCommandResult` with structured `Data` payloads (`Text`, `Json`, or `Markdown`) that the dashboard renders from the notification center's **View response** action. The `CommandResults.Success(string, CommandResultData)` overload makes it easy to return Markdown tables and other rich output. The new `Logger` property on `ExecuteCommandContext` lets command implementations log directly to the resource's log stream.
 
 <Tabs syncKey='aspire-lang'>
 <TabItem id='csharp' label='AppHost.cs'>