ci: switch docs-watch agent to Codex (gpt-5.6-luna, high effort)

Author: MalikZu

.github/workflows/docs-watch.yml

@@ -66,6 +66,7 @@ jobs:
         with:
           openai-api-key: ${{ secrets.OPENAI_API_KEY }}
           model: gpt-5.6-luna
+          effort: high
           safety-strategy: drop-sudo
           prompt: |
             The upstream UAE PASS documentation at https://docs.uaepass.ae has changed.