ci(docs): trigger Pages deploy from main instead of tags

The github-pages environment's branch/tag protection rules block
deploys from version tags, so the deploy job failed after release.
Switching to push-on-main avoids the rule and still publishes docs
on every release merge.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: gjtorikian

.github/workflows/docs.yml

@@ -1,7 +1,7 @@
 name: Publish API Docs
 on:
   push:
-    tags: ['v*']
+    branches: [main]
   workflow_dispatch:
 permissions:
   contents: read