Add public building project setting

docs/circuit-list-editor-api.md

@@ -73,9 +73,11 @@ Protected-board structure uses
 `circuit-protection.update`. A subtree restore is normally emitted only as the
 persisted inverse of a delete. The dispatcher also supports the documented
 project-device, project settings, distribution-board and project-location
-commands. The generic editor commands listed here use schema version `1`;
-the clean pre-release baseline does not accept older development formats.
-Unsupported types or schema versions are rejected. Insert commands contain the complete entity or circuit block
+commands. The generic editor commands listed here use schema version `1`.
+`project.update-settings` uses version `2` and still accepts supported baseline
+version `1` commands without changing the newer building classification.
+Pre-baseline formats remain unsupported. Unsupported types or schema versions
+are rejected. Insert commands contain the complete entity or circuit block
 with stable ids; delete commands include the expected parent identity. Circuit
 snapshots contain zero, one or multiple complete device rows. Move commands
 contain each row's expected and target circuit plus its exact expected and
@@ -170,12 +172,12 @@ synchronizes linked circuit rows implicitly.
 
 - `PUT /projects/:projectId`
   - request:
-    `{ "expectedRevision": 12, "singlePhaseVoltageV": 230, "threePhaseVoltageV": 400, "enabledDistributionBoardSupplyTypes": ["AV", "MSR", "SiBe"], ...projectMetadata }`
+    `{ "expectedRevision": 12, "isPublicBuilding": true, "singlePhaseVoltageV": 230, "threePhaseVoltageV": 400, "enabledDistributionBoardSupplyTypes": ["AV", "MSR", "SiBe"], ...projectMetadata }`
   - executes `project.update-settings` as one atomic revision
   - response:
     `{ "project": { ... }, "revision": { ... }, "history": { ... } }`
-  - persistent Undo/Redo restores metadata, voltage values and the enabled
-    distribution-board supply types together; project-device and circuit
+  - persistent Undo/Redo restores metadata, the public-building flag, voltage
+    values and enabled distribution-board supply types together; project-device and circuit
     voltages are recalculated from the restored project settings in the same
     transaction
   - project-device and circuit voltage are derived values and are not accepted