Allow Claude to read GitHub Actions CI results

Add additional_permissions for actions:read so Claude's MCP server
can access workflow runs and job logs to help debug CI failures.

https://claude.ai/code/session_01BR4nrqzgpFAMjFJBkmrryy

Author: claude

.github/workflows/claude-pr-reactions.yml

@@ -48,3 +48,5 @@ jobs:
           github_token: ${{ secrets.PHPSTAN_BOT_TOKEN }}
           trigger_phrase: "@phpstan-bot"
           claude_args: "--model claude-opus-4-6 --max-turns 50"
+          additional_permissions: |
+            actions: read