chore: update release summary

.changeset/vast-numbers-read.md

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+---
+"@docsearch/docusaurus-adapter": major
+"@docsearch/core": major
+"@docsearch/css": major
+"@docsearch/js": major
+"@docsearch/modal": major
+"@docsearch/react": major
+"@docsearch/sidepanel": major
+"@docsearch/sidepanel-js": major
+---
+
+# DocSearch v5-beta
+
+DocSearch v5 is a major release that introduces AI-powered answers via Agent
+Studio, a refreshed search UI, and a modernized package architecture.
+
+## Ask AI & Agent Studio
+
+- Agent Studio integration with core tools and dynamic tool calls
+- Conversation memory support
+- Compatibility with the Algolia MCP search tool, with aggregated MCP search
+  tool calls
+- Dynamic index selection for Agent Studio
+- Feedback integration, including feedback notes and tags
+- Prompt suggestions in keyword search and follow-up prompt suggestions
+- Ask AI modal split into its own component and Ask AI transport layer removed
+
+## Search UI
+
+- Refreshed v5 UI with improved dark theme, sources panel, and accessibility
+- Faceted search with filter chips
+- Hit breadcrumbs and result badges
+
+## Packaging & architecture
+
+- New `@docsearch/cli` package for MCP setup and search
+- MCP plugin support
+- Split JS bundles for search-only usage and JS-based hybrid mode
+- Migrated the build system to tsdown
+- Migrated CSS building to LightningCSS
+
+## Breaking changes
+
+- Ask AI related props are now nested under a single root `askai` option
+- The Ask AI transport layer has been removed
+