CMS-024L — Update PGN editorial workflow documentation

README.md

@@ -21,15 +21,15 @@ Chess Material Studio helps chess players and coaches work with a local puzzle c
 - Create or open editorial projects, organize them into Chapters, and optionally set a target puzzle count for each Chapter.
 - Review puzzles in an active Chapter as `Selected` or `Discarded`, clear a review decision, and resume the same editorial work after reopening the project.
 - Load and export selected editorial puzzles by active Chapter, marked Chapters, or the complete project.
-- Review PGN files, capture a position, and add it to the active Chapter; saved PGN position snapshots are recovered as a read-only list when the project is reopened.
+- Review PGN files, capture a position, and add it to the active Chapter; saved positions can be reopened after reopening the project to continue reviewing and navigating without the original PGN file.
 
 ## Editorial workflow
 
 Projects are optional: the normal offline puzzle search and solver work without opening one. To prepare editorial material, create or open a project, create Chapters, choose an active Chapter, and optionally set its target puzzle count. Search the puzzle corpus, then review each puzzle as `Selected` or `Discarded`; a decision can also be cleared.
 
 Each project is stored in its own `.cms.sqlite` file. Reviews persist with a complete snapshot of the relevant puzzle data, rather than only its `PuzzleId`, so `Selected` and `Discarded` work survives closing and reopening a project. Project files also persist reproducible PGN position snapshots by Chapter. The selected puzzles of the active Chapter can be loaded back into the solver in their editorial order.
 
-The current PGN editorial flow is **PGN review → capture position → Add to active chapter**. Saved positions are recovered and shown read-only in the Projects tab after reopening the project.
+The current PGN editorial flow is **PGN review → capture position → Add to active chapter → persist → close and reopen the project → recover the saved position → Open saved position → continue PGN review and navigation**. Opening a saved position restores the saved ply in PGN review; the central board shows it in read-only mode, with previous/next navigation through the main line. The original PGN file is not needed to reopen a persisted position.
 
 During normal searches of the puzzle corpus, reviewed puzzles in the active Chapter are excluded from new results. This exclusion does not apply to Favorites searches. A puzzle marked `Selected` cannot be selected simultaneously in another Chapter of the same project; this restriction does not apply to `Discarded` reviews.