Persist circuit structure edits

docs/circuit-list-editor-api.md

@@ -36,8 +36,9 @@ snapshots contain zero, one or multiple complete device rows. Move commands
 contain each row's expected and target circuit plus its exact expected and
 target sort order. This makes deletion and moves undoable without generating
 replacement identities or renumbering circuits. Existing Circuit and
-CircuitDeviceRow cell edits in the editor consume these endpoints; the
-remaining structural editor writes are still being migrated.
+CircuitDeviceRow cell edits plus standalone insert/delete actions in the editor
+consume these endpoints. Move, reorder and renumber UI paths are still being
+migrated.
 
 `circuit-device-row.move` targets existing circuits in the same circuit list.
 `circuit-device-row.move-with-new-circuit` atomically creates exactly one
@@ -163,39 +164,17 @@ Response sketch:
 }
 ```
 
-### Circuit CRUD
+### Circuit Structure
 
-- `POST /projects/:projectId/circuit-lists/:circuitListId/circuits`
-  - create circuit in list/section
-- `POST /projects/:projectId/circuit-lists/:circuitListId/circuits-with-device-rows`
-  - atomically create one circuit and one or more initial device rows
-- `DELETE /circuits/:circuitId`
-  - delete circuit (and related rows via DB relations)
 - `GET /circuit-sections/:sectionId/next-identifier`
   - preview next identifier for section (`prefix + maxSuffix + 1`)
 
-Request sketch (`POST .../circuits`):
-
-```json
-{
-  "sectionId": "sec_1",
-  "equipmentIdentifier": "-2F14",
-  "displayName": "Sockets East",
-  "sortOrder": 140
-}
-```
-
-### Device Row CRUD
-
-- `POST /circuits/:circuitId/device-rows`
-  - create row inside a circuit
-- `DELETE /circuit-device-rows/:rowId`
-  - delete row
-
-Circuit and device-row field updates are available only as versioned
-`circuit.update` and `circuit-device-row.update` commands through
-`POST /projects/:projectId/commands`. There are no direct field-update PATCH
-routes.
+Circuit and device-row field updates, standalone insertions and standalone
+deletions are available only as the corresponding versioned commands through
+`POST /projects/:projectId/commands`. There are no direct field-update PATCH,
+structure POST or CircuitDeviceRow DELETE routes. The direct
+`DELETE /circuits/:circuitId` route remains temporarily for the inverse of the
+not-yet-migrated placeholder move UI and must not be used by new features.
 
 ### Move Device Row