BB1: full E40 S16F11 body — MF, PRRECIPEMETHOD, RCPVARS, PRPROCESSPARAMS

Replaces the simplified <L,3 PRJOBID PPID MTRLOUTSPEC> demo body with
the full SEMI E40-0705 §10.2 shape:

  <L,5 PRJOBID MF PRRECIPEMETHOD
       <L,2 PPID <L,n <L,2 RCPPARNM RCPPARVAL>>>
       <L,n MTRLOUTSPEC>
       <L,n <L,2 PARAMNAME PARAMVAL>>>

ProcessJob now carries the extra fields (MaterialFlag, ProcessRecipeMethod,
RcpVar[], ProcessParam[]) so a tool's recipe engine can later consume
the recipe-variable overrides and per-job process parameters.  Server
S16F11 dispatch populates them via the new ProcessJobStore::set_e40_extras
helper after a successful create.

MaterialFlag + ProcessRecipeMethod enums live in their own tiny header
(`e40_constants.hpp`) so process_jobs.hpp (the store) can use them
without dragging in messages_helpers.hpp (which would create a circular
include via data_model.hpp).

The simplified 3-arg HostHandler::send_create_process_job convenience
remains; it constructs a sensible-default PRJobCreateRequest internally.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/gem/host_handler.cpp

@@ -218,7 +218,17 @@ void HostHandler::send_terminal_display_multi(uint32_t tid,
 void HostHandler::send_create_process_job(
     const std::string& prjobid, const std::string& ppid,
     const std::vector<std::string>& mtrloutspec, ReplyHandler cb) {
-  send_request(s16f11_pr_job_create(prjobid, ppid, mtrloutspec), std::move(cb));
+  // Simplified caller (no MF / process params / recipe-vars).  Fill in
+  // sensible E40 defaults: substrate-flow, recipe-only (no var tuning),
+  // empty rcpvars + params.
+  PRJobCreateRequest req{
+      prjobid,
+      MaterialFlag::Substrate,
+      ProcessRecipeMethod::RecipeOnly,
+      RecipeSpec{ppid, {}},
+      mtrloutspec,
+      {}};
+  send_request(s16f11_pr_job_create(req), std::move(cb));
 }
 
 void HostHandler::send_pr_job_command(const std::string& prjobid,