feat(exams): add rich editor actions, auto-mark, preview, services, and config
- Add actions-helpers and actions-rich-editor for rich text exam editing - Add ai-pipeline/auto-mark for automatic exam marking - Add exam-boundaries and exam-preview components - Add config directory for exam configuration - Add data-access-cross-module for cross-module data access - Add editor/exam-nodes-to-editor-doc and editor/utils for editor utilities - Add use-exam-preview-rewrite, use-exam-preview-state, use-exam-preview-tasks hooks - Add services directory
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