feat: report source label in dry-run summaries

docs/README.md

@@ -55,7 +55,7 @@ Current patchable runtime fields via `POST /config`:
 ## Dry run
 
 The dry-run mode generates a synthetic, hardware-free frame summary based on the current config.
-It is intended as a no-hardware smoke path for the CLI and config/control-adjacent logic.
+It now reports the active source label as well, so dry-run output is less disconnected from the offline/sim paths.
 
 The HTTP control plane also exposes `GET /dry-run` for quick inspection of the currently effective no-hardware summary.
 

internal/dryrun/dryrun.go

@@ -19,6 +19,7 @@ type FrameSummary struct {
     PilotLevel     float64   `json:"pilotLevel"`
     RDSInjection   float64   `json:"rdsInjection"`
     OutputDrive    float64   `json:"outputDrive"`
+    Source         string    `json:"source"`
     PreviewSamples []float64 `json:"previewSamples"`
 }
 
@@ -32,6 +33,10 @@ func Generate(cfg cfgpkg.Config) FrameSummary {
         }
         preview[i] = sign * base * float64(i+1) / 16.0
     }
+    source := "tones"
+    if cfg.Audio.InputPath != "" {
+        source = cfg.Audio.InputPath
+    }
     return FrameSummary{
         Mode:           "dry-run",
         FrequencyMHz:   cfg.FM.FrequencyMHz,
@@ -42,6 +47,7 @@ func Generate(cfg cfgpkg.Config) FrameSummary {
         PilotLevel:     cfg.FM.PilotLevel,
         RDSInjection:   cfg.FM.RDSInjection,
         OutputDrive:    cfg.FM.OutputDrive,
+        Source:         source,
         PreviewSamples: preview,
     }
 }

internal/dryrun/dryrun_test.go

@@ -17,6 +17,18 @@ func TestGenerate(t *testing.T) {
     if len(frame.PreviewSamples) != 16 {
         t.Fatalf("unexpected preview length: %d", len(frame.PreviewSamples))
     }
+    if frame.Source != "tones" {
+        t.Fatalf("unexpected source: %s", frame.Source)
+    }
+}
+
+func TestGenerateUsesInputPathAsSource(t *testing.T) {
+    cfg := cfgpkg.Default()
+    cfg.Audio.InputPath = "demo.wav"
+    frame := Generate(cfg)
+    if frame.Source != "demo.wav" {
+        t.Fatalf("unexpected source: %s", frame.Source)
+    }
 }
 
 func TestWriteJSONFile(t *testing.T) {