Document that Copilot coding agent is not available in Proxima (#55803)

Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>

Author: timrogers

content/admin/data-residency/feature-overview-for-github-enterprise-cloud-with-data-residency.md

@@ -28,6 +28,7 @@ The following features are currently unavailable on {% data variables.enterprise
 | {% data variables.product.prodname_copilot %} Workspaces | Currently unavailable | N/A |
 | {% data variables.product.prodname_copilot_extensions %} | Currently unavailable | [AUTOTITLE](/copilot/using-github-copilot/using-extensions-to-integrate-external-tools-with-copilot-chat) |
 | {% data variables.product.prodname_copilot_short %} Metrics API | Currently unavailable | [AUTOTITLE](/rest/copilot/copilot-metrics) |
+| {% data variables.product.prodname_copilot_agent %} | Currently unavailable | [AUTOTITLE](/copilot/using-github-copilot/coding-agent/about-assigning-tasks-to-copilot) |
 | Restricting {% data variables.product.prodname_actions %} policies to verified creators | Currently unavailable | [AUTOTITLE](/admin/enforcing-policies/enforcing-policies-for-your-enterprise/enforcing-policies-for-github-actions-in-your-enterprise#allow-enterprise-and-select-non-enterprise-actions-and-reusable-workflows) |
 | Some features currently in {% data variables.release-phases.public_preview %} or {% data variables.release-phases.private_preview %} | Certain features that are in a preview phase on {% data variables.product.prodname_dotcom_the_website %} may not be available on {% data variables.enterprise.data_residency_site %} | |
 

content/copilot/using-github-copilot/coding-agent/about-assigning-tasks-to-copilot.md

@@ -103,6 +103,7 @@ Users can include hidden messages in issues assigned to {% data variables.produc
 * **{% data variables.product.prodname_copilot_short %} does not sign its commits**. If you have the "Require signed commits" rule or branch protection enabled, you must rewrite the commit history in order to merge {% data variables.product.prodname_copilot_short %}'s pull requests. See [AUTOTITLE](/repositories/configuring-branches-and-merges-in-your-repository/managing-rulesets/available-rules-for-rulesets#require-signed-commits).
 * **{% data variables.product.prodname_copilot_short %} does not work with self-hosted {% data variables.product.prodname_actions %} runners**. {% data variables.product.prodname_copilot_short %} has access to its own development environment, running in {% data variables.product.prodname_actions %}, and must use {% data variables.product.prodname_dotcom %}-hosted runners. See [AUTOTITLE](/copilot/customizing-copilot/customizing-the-development-environment-for-copilot-coding-agent#upgrading-to-larger-github-hosted-github-actions-runners).
 * **{% data variables.product.prodname_copilot_short %} doesn't account for content exclusions**. Content exclusions allow administrators to configure {% data variables.product.prodname_copilot_short %} to ignore certain files. When using {% data variables.copilot.copilot_coding_agent %}, {% data variables.product.prodname_copilot_short %} will not ignore these files, and will be able to see and update them. See [AUTOTITLE](/copilot/managing-copilot/configuring-and-auditing-content-exclusion/excluding-content-from-github-copilot).
+* **{% data variables.copilot.copilot_coding_agent %} is not available in {% data variables.enterprise.data_residency %}**. The agent is only available in {% data variables.product.prodname_dotcom_the_website %}.
 
 ## Further reading