DOC-3542: Document TinyMCE AI plugin availability for self-hosted customers

modules/ROOT/pages/8.7.0-release-notes.adoc

@@ -28,6 +28,14 @@ include::partial$misc/admon-releasenotes-for-stable.adoc[]
 
 The following premium plugin updates were released alongside {productname} {release-version}.
 
+=== TinyMCE AI
+
+Starting with {productname} {release-version}, the **TinyMCE AI** plugin is available to self-hosted customers for the first time. Previously, the plugin could only be loaded from the {cloudname} CDN.
+
+From this release, the `+tinymceai+` plugin is included in the `+tinymce-premium+` NPM package and is available as a standalone addon `.zip` download from the link:{accountpageurl}[{accountpage}]. The plugin is distributed only as an addon and is not included in any {productname} ZIP bundle.
+
+A self-hosted plugin still connects to an AI service. Point it at the hosted {cloudname} AI service, or deploy the xref:tinymceai-on-premises.adoc[self-hosted AI service] to keep content within the host network. For installation steps, see: xref:npm-projects.adoc#install-premium-plugins[Quick start: {productname} from NPM or Yarn]. For plugin configuration, see: xref:tinymceai.adoc[TinyMCE AI].
+
 // === <Premium plugin name 1> <Premium plugin name 1 version>
 
 // The {productname} {release-version} release includes an accompanying release of the **<Premium plugin name 1>** premium plugin.

modules/ROOT/pages/tinymceai-integration-options.adoc

@@ -15,7 +15,7 @@
 [.lead]
 xref:tinymceai.adoc[**Plugin Configuration**]
 
-Integrate {pluginname} features directly into the {productname} editor interface out of the box. Works with the {cloudname} CDN or self-hosted {productname}; both use the hosted AI service with JWT authentication.
+Integrate {pluginname} features directly into the {productname} editor interface out of the box. Works with the {cloudname} CDN or a self-hosted {productname} editor; from {productname} 8.7.0, the plugin can be installed from the `+tinymce-premium+` NPM package or as an addon `.zip`. The plugin connects to either the hosted {cloudname} AI service or a xref:tinymceai-on-premises.adoc[self-hosted AI service], with JWT authentication in both cases.
 
 |
 [.lead]

modules/ROOT/pages/tinymceai-introduction.adoc

@@ -19,7 +19,7 @@ liveDemo::tinymceai[]
 
 {pluginname} is an AI-powered writing assistant platform with two core components:
 
-* **xref:tinymceai.adoc[{pluginname} plugin]**: Integrates the AI directly into {productname}, providing instant text rewriting, summarization, correction, and contextual chat help based on organizational style guides. It includes automated review tools and enterprise-ready functionality that integrates with existing systems without requiring custom infrastructure.
+* **xref:tinymceai.adoc[{pluginname} plugin]**: Integrates the AI directly into {productname}, providing instant text rewriting, summarization, correction, and contextual chat help based on organizational style guides. It includes automated review tools and enterprise-ready functionality that integrates with existing systems without requiring custom infrastructure. The plugin is available for both {cloudname} and self-hosted {productname}; from {productname} 8.7.0, it can be installed from the `+tinymce-premium+` NPM package or as an addon `.zip`.
 * **xref:tinymceai-api-overview.adoc[TinyMCE AI API]**: A state-of-the-art back-end AI engine that incorporates multiple models and delivers high-quality content. Any functionality available in the plugin is also available in the API, plus more, and the API can be used anywhere in your application -- not just in {productname}. *The hosted AI service is currently available in Cloud setup only.*
 
 These components enable teams to implement a full suite of AI writing tools quickly, delivering efficient content workflows that maintain brand consistency and integrate smoothly with document management systems. In addition, the plugin and API use the same authorisation mechanisms and share conversation history, enabling ease of integration with your application's broader content authoring workflow -- not just within {productname}.

modules/ROOT/pages/tinymceai.adoc

@@ -20,6 +20,23 @@ The {pluginname} plugin integrates AI-assisted authoring with rich-text editing.
 
 liveDemo::{plugincode}[]
 
+[[availability]]
+== Availability
+
+The {pluginname} plugin can be deployed with either a {cloudname} or a self-hosted {productname} editor:
+
+* *{cloudname}*: load the plugin from the {cloudname} CDN.
+* *Self-hosted*: from {productname} 8.7.0, install the plugin from the `+tinymce-premium+` NPM package, or as a standalone addon `.zip` download from the link:{accountpageurl}[{accountpage}].
+
+The `+tinymceai+` plugin is distributed only as a standalone addon. It is not included in any {productname} ZIP bundle.
+
+For self-hosted installation steps, see xref:npm-projects.adoc#install-premium-plugins[Install premium plugins from NPM] or xref:installation-zip.adoc[Installing {productname} using a .zip file].
+
+[NOTE]
+====
+The plugin requires an AI service to operate. Use the hosted {cloudname} AI service, or deploy the xref:tinymceai-on-premises.adoc[self-hosted AI service] to keep content within the host network. In both cases, a xref:tinymceai-jwt-authentication-intro.adoc[JWT token endpoint] handles authentication.
+====
+
 [[basic-setup]]
 == Basic setup
 

modules/ROOT/partials/misc/admon-ai-pricing.adoc

@@ -1 +1 @@
-NOTE: {pluginname} was {productname}'s first iteration of integrating AI functionality into the editor. xref:tinymceai-introduction.adoc[TinyMCE AI] is the current AI solution, providing deep document-aware AI functionality through Chat, Quick Actions, and a Review mode. TinyMCE AI is currently available via cloud deployment; on-premise deployment is coming in a future release.
+NOTE: {pluginname} was {productname}'s first iteration of integrating AI functionality into the editor. xref:tinymceai-introduction.adoc[TinyMCE AI] is the current AI solution, providing deep document-aware AI functionality through Chat, Quick Actions, and a Review mode. TinyMCE AI works with both {cloudname} and self-hosted {productname} editors, and can connect to the hosted {cloudname} AI service or a xref:tinymceai-on-premises.adoc[self-hosted AI service].