chore: mark CORE-003 as done in roadmap

docs/roadmap/ROADMAP.yaml

@@ -14,7 +14,6 @@ notes:
   - Alpha migration policy: once alpha is declared, compatibility only needs to move forward; backward migrations are not required.
 priority_queue:
   - EXEC-002
-  - CORE-003
   - DATA-DB-005
   - DATA-002A
   - DATA-001A
@@ -24,7 +23,7 @@ priority_queue:
   - GCF-001
   - DATA-DB-006
 recently_completed:
-  - DATA-DB-003
+  - CORE-003
   - CONV-001
   - DATA-DB-004
   - PORTFOLIO-003
@@ -60,6 +59,7 @@ states:
     - GCF-001
   in_progress: []
   done:
+    - CORE-003
     - CONV-001
     - DATA-DB-003
     - DATA-DB-004

docs/roadmap/done/CORE-003-mypy-type-safety.yaml

@@ -5,9 +5,10 @@ description: |
   Currently 42 errors in 15 files. The CI uses `|| true` to allow warnings,
   but we should fix these properly with strong types and conversion functions.
   
-status: backlog
+status: done
 priority: medium
 created_at: 2026-03-29
+completed_at: 2026-03-29
 dependencies: []
   
 acceptance_criteria: