fix: edit ops review findings

From the review of 7723711:
- The assembler is locked: a client closed for a full queue is closed
  by the task that was sending, loop(), whose disconnect dropped the
  buffer while async_tcp could be copying into it. A whole message is
  taken out of it, so a disconnect can't free it while it is read.
- loop() expires a message stalled for 10 s, freeing its buffer and
  telling its client, instead of holding it until another client came.
  A binary message is refused before it can touch another's buffer.
- Each edit takes only the fields its route reads; one it would ignore
  is refused by name. linkRemote's rolling code goes in under the
  route's name, so applyModelEdit is unchanged again.
- An edit refused for an id that doesn't exist replies not found
  (edit_result_t::missing). A reply that doesn't fit its buffer goes
  as an internal error, so the op still gets one.
- The TYPE table says what becomes of each op (proto_op_t), which the
  socket switches on. The reply address is one proto_reply_to_t. The
  routes and the ops start and queue an edit the same way
  (newModelEdit, submitModelEdit). The full-list texts and the offered
  remote address rule live in ModelEditor.
- e2e: the sort order test skips a list that it would renumber.

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

test/e2e/test_edits.py

@@ -75,15 +75,27 @@ def test_an_edit_of_a_missing_shade_says_why(connect, schema):
     """Refused by the edit itself on loop(), as its route would be."""
     c, shades, _ = synced_model(connect, schema)
     reply = op(c, schema, "saveShade", {"shadeId": unused(shades, "shadeId"), "name": "x"})
-    assert error_name(schema, reply) == "badRequest"
+    assert error_name(schema, reply) == "notFound"
     assert reply["d"][schema.keys["desc"]] == "Shade Id not found."
 
 
+def test_a_field_an_edit_doesnt_take_is_refused(connect, schema):
+    c, shades, _ = synced_model(connect, schema)
+    reply = op(c, schema, "saveShade", {"shadeId": unused(shades, "shadeId"), "paired": 1})
+    assert error_name(schema, reply) == "badRequest"
+    assert reply["d"][schema.keys["desc"]] == "paired can't be set by this edit"
+
+
 def test_a_sort_order_set_to_what_it_is(connect, schema):
     c, shades, _ = synced_model(connect, schema)
     if not shades:
         pytest.skip("the device has no shades")
-    ids = [s["shadeId"] for s in sorted(shades, key=lambda s: s.get("sortOrder", 0))]
+    ordered = sorted(shades, key=lambda s: s.get("sortOrder", 0))
+    # A sort order numbers the shades 0, 1, 2...: only a list already numbered
+    # so stays as it is.
+    if [s.get("sortOrder", 0) for s in ordered] != list(range(len(ordered))):
+        pytest.skip("the shades' sort orders have gaps or repeats, which a sort order would renumber")
+    ids = [s["shadeId"] for s in ordered]
     reply = op(c, schema, "shadeSortOrder", {"ids": ids})
     assert is_ok(schema, reply)
     order = c.recv_until(lambda f: f["t"] == schema.type_numbers["shadeOrder"])[-1]