Replace the Revit drawer with the assignment dialog

- RevitAssignmentDialog: objects as room/group/object with multi-select,
  filters and drag-and-drop or keyboard assignment onto rows, circuits or
  new circuits; room-wise automatic split under the socket limit; local
  plan with review of conflicts and limit overruns, one command on apply
  and re-check after a revision conflict.
- Row badge and context menu list linked objects and detach single
  objects or all; the context menu opens the dialog for a circuit.
- Remove the R7 drawer and direct grid drops; update AGENTS.md, API and
  architecture docs and mark R11-R14 complete.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/project-version-history.test.ts

@@ -289,6 +289,7 @@ describe("project settings presentation", () => {
           workStage: null,
           projectLead: null,
           projectEditor: null,
+          maxSocketsPerCircuit: null,
           currentRevision: 0,
         },
         usedDistributionBoardSupplyTypes: ["SiBe"],