Documentation corrections: dependency requirements and AI module version
## Problem Follow-up to: #3586294+s Parent: #3586310+s _**This issue should be verified prior to working on it to make sure it is valid.**_ Two user-facing doc errors beta testers will hit: - `docs/index.md` lists Scheduler and Scheduler Content Moderation Integration as **required**; `README.md` and `composer.json` (require-dev) treat them as optional, and the code degrades gracefully without them. - `README.md` states AI module `^1.3.4`; `composer.json` requires `drupal/ai ^1.4 || ^2`. ## Proposed resolution Fix `docs/index.md` to mark both modules optional and correct the README version string. ## AI usage - [x] AI assisted issue
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