docs: split CORE-002 into rollout slices

docs/roadmap/ROADMAP.yaml

@@ -11,9 +11,10 @@ notes:
   - One task lives in one YAML file and changes state by moving between status folders.
   - Priority ordering is maintained here so agents can parse one short file first.
 priority_queue:
-  - CORE-002
+  - CORE-002B
   - CORE-001D
   - BT-003B
+  - CORE-002
   - PORT-003
   - BT-002
   - BT-001C
@@ -24,12 +25,12 @@ priority_queue:
   - OPS-001
   - BT-003
 recently_completed:
+  - CORE-002A
   - CORE-001D1
   - SEC-001
   - SEC-001A
   - CORE-001A
   - CORE-001B
-  - CORE-001C
 states:
   backlog:
     - DATA-002A
@@ -44,6 +45,7 @@ states:
     - BT-001C
     - CORE-001D
     - CORE-002
+    - CORE-002B
   in_progress: []
   done:
     - DATA-001
@@ -62,5 +64,6 @@ states:
     - CORE-001A
     - CORE-001B
     - CORE-001C
+    - CORE-002A
   blocked: []
   cancelled: []