feat(launcher): add verified first-run installer

src/AcDream.Bake/BakeProgressReporter.cs

@@ -0,0 +1,34 @@
+namespace AcDream.Bake;
+
+internal static class BakeProgressReporter
+{
+    public static void Write(
+        TextWriter humanOutput,
+        IBakeProgressSink? machineOutput,
+        string phase,
+        long completed,
+        int total,
+        int failures,
+        TimeSpan elapsed,
+        double etaSeconds,
+        long privateBytes,
+        long managedBytes)
+    {
+        ArgumentNullException.ThrowIfNull(humanOutput);
+        humanOutput.WriteLine(
+            $"[{elapsed:hh\\:mm\\:ss}] extracted {completed:N0}/{total:N0}, "
+            + $"failures={failures:N0}, elapsed={elapsed.TotalSeconds:F0}s, "
+            + $"ETA={etaSeconds:F0}s, "
+            + $"private={privateBytes / 1024.0 / 1024.0:F0}MB, "
+            + $"managed={managedBytes / 1024.0 / 1024.0:F0}MB");
+        machineOutput?.Progress(
+            phase,
+            completed,
+            total,
+            failures,
+            elapsed.TotalSeconds,
+            etaSeconds,
+            privateBytes,
+            managedBytes);
+    }
+}