Persist circuit structure edits

AGENTS.md

@@ -220,14 +220,15 @@ After saving, the row becomes linked to the new project device.
 
 ## Undo / Redo
 
-The editor's visible undo/redo stack remains session-local while structural and
-destructive operations are being migrated. Existing Circuit and
-CircuitDeviceRow cell edits already execute persistent project commands and
-their toolbar undo/redo actions use the project-wide history endpoints. The
-tree response supplies the optimistic `currentRevision`; the obsolete direct
-PATCH routes for these fields are removed. Reloading the page does not yet
-reconstruct the visible editor stack. Public command, undo and redo endpoints
-also exist for Circuit/CircuitDeviceRow insertion and deletion.
+The editor's visible undo/redo stack remains session-local while move, reorder
+and renumber operations are being migrated. Existing Circuit and
+CircuitDeviceRow cell edits plus standalone insertion/deletion already execute
+persistent project commands; their toolbar undo/redo actions use the
+project-wide history endpoints. Insertions use client-generated stable UUIDs,
+and deletion undo restores the same ids from complete server snapshots. The
+tree response supplies the optimistic `currentRevision`; obsolete direct field
+PATCH, structure POST and CircuitDeviceRow DELETE routes are removed.
+Reloading the page does not yet reconstruct the visible editor stack.
 CircuitDeviceRow moves between existing circuits and moves that create one new
 placeholder target circuit are persisted. The latter stores the complete empty
 target snapshot so undo can restore the rows and remove only the unchanged