feat: enrich simulated transmit summary details

docs/README.md

@@ -62,7 +62,7 @@ The HTTP control plane also exposes `GET /dry-run` for quick inspection of the c
 ## Simulated transmit
 
 `--simulate-tx` runs the offline generator through the Soapy-oriented simulated backend path and writes an IQ-style artifact to disk.
-This is the current closest no-hardware stand-in for the future transmit pipeline in the main application path.
+The current summary includes backend, input source, frequency, and configured output sample rate.
 
 ## Offline generation
 

internal/app/sim.go

@@ -52,7 +52,7 @@ func RunSimulatedTransmit(cfg cfgpkg.Config, outPath string, duration time.Durat
     if err := backend.Flush(context.Background()); err != nil {
         return "", err
     }
-    return fmt.Sprintf("simulated transmit: backend=%s output=%s duration=%s input=%s", backend.Info().Name, outPath, duration, inputLabel(cfg)), nil
+    return fmt.Sprintf("simulated transmit: backend=%s output=%s duration=%s input=%s freq=%.1fMHz rate=%d", backend.Info().Name, outPath, duration, inputLabel(cfg), cfg.FM.FrequencyMHz, cfg.FM.CompositeRateHz), nil
 }
 
 func inputLabel(cfg cfgpkg.Config) string {

internal/app/sim_test.go

@@ -20,6 +20,9 @@ func TestRunSimulatedTransmit(t *testing.T) {
     if !strings.Contains(summary, "simulated transmit") {
         t.Fatalf("unexpected summary: %s", summary)
     }
+    if !strings.Contains(summary, "freq=") {
+        t.Fatalf("summary missing frequency: %s", summary)
+    }
     if info, err := os.Stat(out); err != nil || info.Size() == 0 {
         t.Fatalf("expected non-empty output file, err=%v", err)
     }