updating documentation

documentation/schema_discussion.md

@@ -170,34 +170,11 @@ Too expensive at scale — only viable for small curated additions on top of an
 
 ### implementation roadmap
 
-#### Finalize data model
-
-text
-
-#### Write and run migrations
-
-text
-
-#### Fill the database (expand import pipeline)
-
-text
-
-#### Decide SUBTLEX → cefr_level mapping strategy
-
-text
-
-#### Generate decks
-
-text
-
-#### Finalize game selection flow
-
-text
-
-#### Define Zod schemas in packages/shared
-
-text
-
-#### Implement API
-
-text
+- [x] Finalize data model
+- [x] Write and run migrations
+- [x] Fill the database (expand import pipeline)
+- [ ] Decide SUBTLEX → cefr_level mapping strategy
+- [ ] Generate decks
+- [ ] Finalize game selection flow
+- [ ] Define Zod schemas in packages/shared
+- [ ] Implement API