chore: add next release channel

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: adriandmitroca

.releaserc.json

@@ -1,5 +1,8 @@
 {
-  "branches": ["main"],
+  "branches": [
+    "main",
+    { "name": "next", "prerelease": "next", "channel": "next" }
+  ],
   "plugins": [
     "@semantic-release/commit-analyzer",
     "@semantic-release/release-notes-generator",