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>

apps/secs_client.cpp

@@ -409,9 +409,15 @@ int main(int argc, char** argv) {
     // ---- E40/E94: create a PJ, wrap it in a CJ, start the CJ ----------
 
     // 14a. S16F11 PRJobCreate PJ-1 with recipe RECIPE-A and 2 wafers.
+    // Uses the full E40-0705 body (MF=Substrate, RecipeOnly, no extras).
     seq->steps.push_back([conn, logfn, fail](auto next) {
+      gem::PRJobCreateRequest pj_req{
+          "PJ-1", gem::MaterialFlag::Substrate,
+          gem::ProcessRecipeMethod::RecipeOnly,
+          gem::RecipeSpec{"RECIPE-A", {}},
+          {"WFR-1", "WFR-2"}, {}};
       conn->send_request(
-          gem::s16f11_pr_job_create("PJ-1", "RECIPE-A", {"WFR-1", "WFR-2"}),
+          gem::s16f11_pr_job_create(pj_req),
           [logfn, fail, next](std::error_code ec, const s2::Message& reply) {
             if (ec) { fail("S16F11", ec); return; }
             auto a = gem::ack_byte(reply);