docs: [LangGraph Server Changelog Bot] Changelog updates for new version(s) (#1804)

Automated changelog update created by the LangGraph Server Changelog
Bot.

Feel free to merge anytime.

---------

Co-authored-by: Kathryn May <[email protected]>

Author: samecrowder

src/langsmith/agent-server-changelog.mdx

@@ -5,6 +5,11 @@ sidebarTitle: Agent Server changelog
 
 [Agent Server](/langsmith/agent-server) is an API platform for creating and managing agent-based applications. It provides built-in persistence, a task queue, and supports deploying, configuring, and running assistants (agentic workflows) at scale. This changelog documents all notable updates, features, and fixes to Agent Server releases.
 
+<a id="2025-12-09"></a>
+## v0.5.36
+- Introduced configurable webhook support, allowing users to customize submitted webhooks and headers.
+- Added an `/ok` endpoint at the root for easier health checks and simplified configuration.
+
 <a id="2025-12-08"></a>
 ## v0.5.34
 - Introduced custom encryption middleware, allowing users to define their own encryption methods for enhanced data protection.