[Radar] Mention new PQ test in changelog/release notes (#25654)

Author: andre-j3sus

src/assets/images/radar/pq-encryption-test.png

@@ -0,0 +1,13 @@
+---
+title: Browser Support Detection for PQ Encryption on Cloudflare Radar
+description: New browser support detection for PQ encryption on Radar.
+products:
+  - radar
+date: 2025-10-06
+---
+
+[**Radar**](/radar/) now includes browser detection for Post-quantum (PQ) encryption.
+The [Post-quantum encryption card](https://radar.cloudflare.com/adoption-and-usage#post-quantum-encryption) now checks whether a user’s browser supports post-quantum encryption.
+If support is detected, information about the key agreement in use is displayed.
+
+![Screenshot of the PQ encryption browser support test on the Adoption & Usage page](~/assets/images/radar/pq-encryption-test.png)

src/content/changelog/radar/2025-10-06-radar-pq-encryption-test.mdx

@@ -3,6 +3,10 @@ link: "/radar/release-notes/"
 productName: Radar
 productLink: "/radar/"
 entries:
+  - publish_date: "2025-10-06"
+    title: Add PQ encryption browser support check
+    description: |-
+      * Added a [post-quantum encryption browser support check](https://radar.cloudflare.com/adoption-and-usage#browser-support) to the PQ encryption card in the Adoption & Usage section.
   - publish_date: "2025-09-29"
     title: Add geolocation, ADM1 dimension to HTTP endpoints, and NetFlows endpoints
     description: |-