docker agent: drop experimental label

Remove the sidebar "Experimental" badge and the summary-bar shortcode
from the Docker Agent landing page, and drop the corresponding entry
from data/summary.yaml. The A2A protocol note in the CLI reference
stays scoped to that sub-feature.

content/manuals/ai/docker-agent/_index.md

@@ -8,14 +8,9 @@ aliases:
 params:
   sidebar:
     group: AI and agents
-    badge:
-      color: violet
-      text: Experimental
 keywords: [ai, agent, docker agent, cagent]
 ---
 
-{{< summary-bar feature_name="Docker Agent" >}}
-
 [Docker Agent](https://github.com/docker/docker-agent) is an open-source framework
 for building teams of specialized AI agents. Instead of prompting one
 generalist model, you define agents with specific roles and instructions that

data/summary.yaml

@@ -70,8 +70,6 @@ Buildx no default:
   requires: Docker Buildx [0.10.4](https://github.com/docker/buildx/releases/tag/v0.10.4) and later
 Cache backend API:
   availability: Experimental
-Docker Agent:
-  availability: Experimental
 Company:
   subscription: [Business]
   for: Administrators