ci: add release-please for automated releases

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

release-please-config.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "packages": {
+    ".": {
+      "release-type": "node",
+      "include-v-in-tag": false
+    }
+  }
+}