feat: edit ops and the reads their forms need, for socket protocol 2

The edit routes become ops 26-44 (addRoom ... groupSortOrder): ProtoEdits
turns an op's payload into the route's request, full names and real
booleans, and loop() applies it with applyModelEdit() as the route
does. The reply goes to the client that sent it, with an add's new id,
or the route's reason and a shade's validation code; the HTTP routes
keep sending requestResult.

getNextRoom, getNextShade, getNextGroup and groupOptions (45-48) are
answered by loop() from the shade model, through a new LoopQueue item.

Messages that arrive in pieces, a frame over one TCP segment or several
frames, are put back together by ProtoAssembly: one at a time across
clients, up to 4 KB, in a buffer held only while one is on its way.
A message in pieces is now told from its first frame's opcode, which
also stops a fragmented message's last frame drawing a second reply.

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

src/SomfyEditor.h

@@ -8,9 +8,14 @@
 // the clients how it went.
 
 // One edit on its way to loop(): the edit route and a copy of its request.
+// From an edit route its result goes to every client as requestResult; from a
+// protocol 2 edit op, as the reply to replyId for the socket client
+// replyClient.
 struct model_edit_t {
   model_edit_type_t type = model_edit_type_t::add_room;
   uint32_t requestId = 0;
+  uint32_t replyClient = 0;
+  uint32_t replyId = 0;
   JsonDocument doc;
 };
 
@@ -20,7 +25,7 @@ bool beginModelEdit();
 uint32_t nextEditRequestId();
 // Gives up an edit that was begun but never queued.  Any task.
 void cancelModelEdit(model_edit_t *edit);
-// Applies the edit, saves it, sends requestResult and frees it.  loop() only.
+// Applies the edit, saves it, tells how it went and frees it.  loop() only.
 void runModelEdit(model_edit_t *edit);
 // Applies the edit to the shade model and saves it.  loop() only.
 edit_result_t applyModelEdit(model_edit_t &edit);