Add component structure commands

docs/spec/09-distribution-board-components-and-protection-groups.md

@@ -593,8 +593,9 @@ Acceptance:
 
 ### C. Persistent Commands and Board Defaults
 
-Status: In progress. New-board defaults C1 are complete; component and group
-management commands C2 are pending.
+Status: In progress. New-board defaults C1 and component insert/delete commands
+C2a1 are complete. Component update/reorder and group management remain
+pending.
 
 - extend `distribution-board.insert` with fixed components and three groups
 - implement component and group CRUD commands
@@ -612,6 +613,19 @@ Implemented in C1:
 - stored schema versions 1 and 2 retain four legacy sections and receive no
   invented components
 
+Implemented in C2a1:
+
+- `distribution-board-component.insert` and
+  `distribution-board-component.delete` persist complete component snapshots
+  with their optional one-to-one protection-device configuration
+- mutable group protection components validate their group ownership and
+  protection-device combination before writing
+- auxiliary components remain footer entries without protection-device data
+- fixed header roles are excluded from these general CRUD commands
+- deletion requires an exact unchanged snapshot; Undo/Redo restores the same
+  component UUID and a late revision/history failure rolls back the complete
+  write
+
 Acceptance:
 
 - new boards contain the agreed fixed structure