Auto-generate content flag now manageable via CLI

Minor Changes

• bf51f1b: Add --auto-generate-content / --no-auto-generate-content to releases admin org update — the single backend gate that decides whether an org gets AI overviews and per-release summaries. Previously the only way to toggle it was a raw curl PATCH. releases admin org get now shows the current value, and releases admin overview plan surfaces an opted_out action for orgs the batch skips because the flag is off.