Added `ZoomLevelChanged` to available events in `DEVEXPRESS_V25_LIMITATIONS.md` and clarified missing events. Created a detailed migration plan in `MIGRATION_PLAN.md` for transitioning from PDF.js to DevExpress DxPdfViewer v25.2.3, including a hybrid approach, testing checklist, and rollback plan. Summarized research findings and API verification in `SESSION_SUMMARY.md`, highlighting limitations, risks, and recommendations for the migration.
