feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/Core/VideoAspectAutoCropperGateTests.cs

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+using System;
+using Paca.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class VideoAspectAutoCropperGateTests
+{
+    [Fact]
+    public void Gate337_VideoAspectAutoCropper_BuildsCenterCropFilter()
+    {
+        var filter = VideoAspectAutoCropper.BuildReframingFilterArgs(ReframingMode.CenterCrop, 1080, 1920);
+
+        Assert.Contains("crop=ih*9/16:ih", filter);
+        Assert.Contains("scale=1080:1920", filter);
+    }
+
+    [Fact]
+    public void Gate338_VideoAspectAutoCropper_BuildsBlurredBackgroundFilter()
+    {
+        var filter = VideoAspectAutoCropper.BuildReframingFilterArgs(ReframingMode.BlurredBackground, 1080, 1920);
+
+        Assert.Contains("split[bg][fg]", filter);
+        Assert.Contains("boxblur", filter);
+        Assert.Contains("overlay=(W-w)/2:(H-h)/2", filter);
+    }
+
+    [Fact]
+    public void Gate339_VideoAspectAutoCropper_BuildsBlackPadFilter()
+    {
+        var filter = VideoAspectAutoCropper.BuildReframingFilterArgs(ReframingMode.BlackPad, 1080, 1920);
+
+        Assert.Contains("pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black", filter);
+    }
+
+    [Fact]
+    public void Gate340_VideoAspectAutoCropper_BuildsFullCommandLine_WithAudioCopy()
+    {
+        var cmd = VideoAspectAutoCropper.BuildReframingCommandLine(
+            inputPath: "C:\\videos\\horizontal.mp4",
+            outputPath: "C:\\videos\\vertical_shorts.mp4",
+            mode: ReframingMode.CenterCrop,
+            targetWidth: 1080,
+            targetHeight: 1920
+        );
+
+        Assert.Contains("-i \"C:\\videos\\horizontal.mp4\"", cmd);
+        Assert.Contains("-c:v libx264 -crf 20 -preset fast", cmd);
+        Assert.Contains("-c:a copy", cmd);
+        Assert.EndsWith("\"C:\\videos\\vertical_shorts.mp4\" -y", cmd);
+    }
+}