Add June 12 changelog entry

changelog.mdx

@@ -9,6 +9,22 @@ import { YouTubeVideo } from '/snippets/youtube-video.mdx';
 For API library updates, see the [Node SDK](https://github.com/onkernel/kernel-node-sdk/blob/main/CHANGELOG.md), [Python SDK](https://github.com/onkernel/kernel-python-sdk/blob/next/CHANGELOG.md), and [Go SDK](https://github.com/onkernel/kernel-go-sdk/blob/main/CHANGELOG.md) changelogs.
 </Note>
 
+<Update label="June 12" tags={["Product", "Docs"]}>
+## Product updates
+
+- Released the [Kernel × Claude Managed Agents cookbook](https://github.com/kernel/claude-managed-agents-kernel), a public recipe for running parallel computer-use agent swarms with [Claude Managed Agents](/integrations/claude-managed-agents) on Kernel cloud browsers, with API keys secured via Vaults.
+- Shipped a `kernel-browser-harness` [skill](https://github.com/kernel/skills) for setting up Kernel browser sessions inside Claude Code with persistent session IDs across calls.
+- Extended `kernel browsers acquire` in the [CLI](https://github.com/kernel/cli) with `name` and `tags` parameters, so pooled browsers can be labeled at acquisition time alongside `browsers create`.
+- Made browser [telemetry](/browsers/telemetry) categories opt-in. The `--telemetry` flag (and `telemetry` request config) now records only the categories you list; enabling telemetry without specifying categories ships a small default set instead of every category.
+
+## Documentation updates
+
+- Published a new [browser telemetry](/browsers/telemetry) guide covering categories, the stream API, and event shapes.
+- Wrote a [Claude Managed Agents](/integrations/claude-managed-agents) integration guide with a link to the public cookbook.
+- Documented the org-wide default [per-project concurrency cap](/info/projects) on the Projects page.
+- Expanded the [CLI reference](/reference/cli) to include several previously missing subcommands.
+</Update>
+
 <Update label="June 5" tags={["Product", "Docs"]}>
 ## Product updates