fix: edit ops second review findings

- A group's sunSensor and a shade's flags are refused by name: the routes
  don't set them.
- setPaired needs paired, and without a shade id it is a bad request.
- groupOptions' payload is parsed in ProtoEdits (parseReadPayload).
- The assembler's mutex is static, so creating it can't fail.
- protoIsReadOp and protoIsShadeOp are gone; the tests use protoOpKind.
- Native tests for missing(), offeredRemoteAddress and the edit ops
  against the TYPE table.

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

src/ProtoOps.h

@@ -16,7 +16,6 @@
 
 // Every command op except sendRemoteCommand becomes a shade request that
 // loop() runs.
-bool protoIsShadeOp(uint8_t type);
 // nullptr when the payload is good and req is filled in; otherwise what is
 // wrong with it, for a bad request reply.
 const char *parseShadeOp(uint8_t type, JsonObjectConst d, shade_request_t &req);