docs: Add Motorhead node deprecation notice (#4211)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Kartik Balasubramanian <22399046+HumanistSerif@users.noreply.github.com>

docs/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymotorhead.md

@@ -7,6 +7,10 @@ priority: medium
 
 # Motorhead node
 
+/// warning | Deprecated
+The Motorhead project is no longer maintained. This node is deprecated, and will be removed in a future version.
+///
+
 Use the Motorhead node to use Motorhead as a [memory](/glossary.md#ai-memory) server.
 
 On this page, you'll find a list of operations the Motorhead node supports, and links to more resources.

docs/integrations/builtin/credentials/motorhead.md

@@ -7,6 +7,10 @@ priority: medium
 
 # Motorhead credentials
 
+/// warning | Deprecated
+The Motorhead project is no longer maintained. The [Motorhead node](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymotorhead.md) is deprecated, and will be removed in a future version.
+///
+
 You can use these credentials to authenticate the following nodes:
 
 * [Motorhead](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymotorhead.md)

docs/release-notes.md

@@ -68,6 +68,14 @@ This is the `beta` version. n8n recommends using the `stable` version. The `beta
 
 This release contains bug fixes.
 
+### Deprecated nodes
+
+<br />
+
+#### Motorhead node
+
+The [Motorhead](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymotorhead.md) memory node is now deprecated because the Motorhead project is no longer maintained. The node is hidden from the nodes panel for new selections, but existing workflows using this node will continue to work.
+
 ### Contributors
 
 [AmitAnveri](https://github.com/AmitAnveri)