docs: add changelog for aud31-sep13

Author: skeptrunedev

changelog.mdx

@@ -5,6 +5,50 @@ rss: true
 noindex: true
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+<Update label="August 31 - September 13" tags={["New releases", "Improvements"]} rss={{ title: "Weekly Updates", description: "AI 404 suggestions, assistant web search with external sources, security enhancement, and reliability fixes" }}>
+
+## Major releases
+
+- **Major enhancement**: AI suggested pages on 404 pages, [when someone hits a dead link → AI agent reads the path → suggests semantically similar pages](https://x.com/mintlify/status/1966625627773059495)
+- **Major release**: web search for assistant can now include external sources  
+  _Note: Contact us to enable this feature for your site._
+
+## Assistant and MCP
+
+- Fixed a bug where the assistant would be incorrectly rate limited due to time window not sliding correctly
+- Fixed a bug with assistant tool calling to properly handle empty `text` blocks
+- Fixed a bug where MCP server name's concatenated with tool calls were sometiems exceeding the 60 chracter length MCP clients enforce 
+- Fixed a bug where the assistant menu would have a height several times larger than the viewport and scroll forever
+- Fixed a bug where assistant spend values could display with greater than two decimal places in the dashboard
+
+## Web editor and deployments
+
+- Security enhancement added to editor such that only users with `write permissions` for the connected git hosting repository can make changes
+- Fixed a bug where preview deployments wouldn't work for branches with `=` in the name
+- Fixed a bug where long branch names would overflow modals on preview deployment creations
+- Quality of life improvement where email query parameter will prefill the input on signup invitations
+- Fixed a bug where copying a page from the context menu was not working on safari 
+
+## API playground and navigation
+
+- Multiple API playground response codes now display in a controlled styled select menu instead of the system default select menu when focused
+- You can now use the `expanded` fields on navigation groups in your `docs.json` to make them be default open
+
+## SEO and UI
+
+- Fixed a bug where favicons were not showing up in search engines by serving them from the same URL as the documentation site itself for each respective site
+- Fixed a bug where youtube embeds would flash in and out on load
+- Fixed a bug where expanding the feedback menu to include written responses would cause layout shift with the table of contents
+- Fixed a bug where text would leak above the topbar on the maple theme when a dismissed the notification banner
+- Enhanced the Maple and Willow themes by adding login/logout buttons to the sidebar for easier access 
+
+## Analytics and exports
+
+- Fixed reliability issues with assistant analytics view and exports
+- Assistant analytics exports are now executed in the backrground and sent via email for a more reliable experience
+
+</Update>
+
 <Update label="August 24 - August 30" tags={["Improvements"]} rss={{ title: "Weekly Updates", description: "Enhanced feedback collection, navigation improvements, and authentication bug fixes" }}>
 
 ## Major release: Enhanced feedback collection