Merge pull request #8564 from camunda/claude/update-c8run-89-release-announcements

[WIP] Add missing C8Run 8.9 changes to release announcements

Author: hisImminence

docs/reference/announcements-release-notes/890/890-announcements.md

@@ -603,10 +603,27 @@ Because Kafka treats a changed group ID as a brand-new consumer group, affected
 </div>
 <div className="release-announcement-content">
 
+#### Camunda 8 Run: Docker Compose support removed
+
+The `--docker` flag and bundled Docker Compose files have been removed from Camunda 8 Run in 8.9. Camunda 8 Run and Docker Compose are now separate distribution artifacts.
+
+**Action:** If you previously started Docker Compose via `./c8run start --docker`, download the standalone [Docker Compose distribution](/self-managed/quickstart/developer-quickstart/docker-compose.md) from GitHub releases or the Camunda Download Center and run it independently.
+
+</div>
+</div>
+
+<div className="release-announcement-row">
+<div className="release-announcement-badge">
+<span className="badge badge--breaking-change">Breaking change</span>
+</div>
+<div className="release-announcement-content">
+
 #### Camunda 8 Run with H2 as the default secondary data storage
 
 Camunda 8 Run now uses H2 as the default secondary data storage, instead of Elasticsearch. Elasticsearch is no longer bundled with Camunda 8 Run.
 
+The `--disable-elasticsearch` flag is also removed, as Elasticsearch is no longer bundled. To use Elasticsearch as secondary storage, configure an external instance via `--config` and the `application.yaml`.
+
 When running with H2 (or any other RDBMS) as secondary storage, Camunda is only compatible with the V2 API. As a result, some features are not available in Operate and Tasklist. See [Migrate to the V2 Orchestration Cluster API](/apis-tools/migration-manuals/migrate-to-camunda-api.md) for more details.
 
 To continue using features exclusive to the V1 API, configure Camunda 8 Run with an external Elasticsearch instance and switch back to V1 mode.

docs/reference/announcements-release-notes/890/890-release-notes.md

@@ -128,6 +128,8 @@ Camunda 8.9 adds a documentation-focused MCP server so IDEs and AI tools can que
 
 Camunda 8 Run is easier to use in 8.9 with clearer CLI guidance, improved Elasticsearch startup errors, guided Java detection, clean-state support, and more visible connection and credential details. The 8.9 release also includes the unified configuration file and expanded documentation for local development workflows.
 
+The `--docker` flag and bundled Docker Compose files have been removed. Docker Compose is now a standalone distribution artifact. C8Run now opens Operate on startup instead of the quickstart documentation page.
+
 <p class="link-arrow">[Camunda 8 Run](/self-managed/quickstart/developer-quickstart/c8run.md)</p>
 
 ### Flexible local secondary storage

docs/reference/announcements-release-notes/890/whats-new-in-89.md

@@ -154,6 +154,10 @@ The Camunda 8 Run CLI and configuration is enhanced to:
 
 These changes reduce friction when setting up Camunda 8 Run for the first time, debugging local setup issues, and switching between different configurations or environments.
 
+:::info Breaking change
+The `--docker` flag and bundled Docker Compose files have been removed from Camunda 8 Run. Docker Compose is now a standalone distribution artifact. See [release announcements](/reference/announcements-release-notes/890/890-announcements.md#camunda-8-run-docker-compose-support-removed) for migration details.
+:::
+
 <p class="link-arrow">[Camunda 8 Run](/self-managed/quickstart/developer-quickstart/c8run.md)</p>
 
 ### Secondary storage