100%/D: Trace Data Collection (S2F23/F24 + S6F1/F2, E30 §6.12)

New TraceStore keyed by TRID; each entry is a TraceConfig with
DSPER + TOTSMP + REPGSZ + SVID list.  S2F23 validates that every SVID
exists (TIAACK=4 otherwise) and registers the trace.

S6F1's body is L,4 of {TRID U4, SMPLN U4, STIME ASCII, list_of <Item>}
— the application chooses whether each value Item is a scalar SVID
value or a packed batch.

The periodic sampling timer that turns an active TraceConfig into
S6F1 emissions is intentionally left to the application (E5 doesn't
mandate a specific scheduler and vendors typically already have one).

Four new SxFy in the catalog.

COMPLIANCE.md: Trace Data Collection Additional capability flips ✅.
Tests: 82 cases / 477 assertions.

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

apps/secs_server.cpp

@@ -290,6 +290,23 @@ int main(int argc, char** argv) {
     return gem::s2f42_host_command_ack(result.ack, {});
   });
 
+  router.on(2, 23, [model, logfn](const s2::Message& msg) {
+    auto req = gem::parse_s2f23(msg);
+    auto ack = gem::TraceAck::Accept;
+    if (!req) {
+      ack = gem::TraceAck::InvalidPeriod;
+    } else {
+      for (auto v : req->svids) {
+        if (!model->vid_exists(v)) { ack = gem::TraceAck::UnknownVid; break; }
+      }
+      if (ack == gem::TraceAck::Accept) {
+        model->traces.add({req->trid, req->dsper, req->totsmp, req->repgsz, req->svids});
+      }
+    }
+    logfn("S2F23 -> S2F24 TIAACK=" + std::to_string(static_cast<int>(ack)));
+    return gem::s2f24_trace_initialize_ack(ack);
+  });
+
   router.on(2, 45, [model, logfn](const s2::Message& msg) {
     auto req = gem::parse_s2f45(msg);
     auto ack = gem::LimitMonitorAck::Accept;