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/VideoDenoiseEnhancerGateTests.cs

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+using System;
+using Paca.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class VideoDenoiseEnhancerGateTests
+{
+    [Fact]
+    public void Gate401_VideoDenoiseEnhancer_BuildsFastHqdn3dFilter()
+    {
+        var filter = VideoDenoiseEnhancer.BuildEnhanceFilterChain(denoise: true, sharpen: false, DenoisePreset.FastTemporalSpatial);
+
+        Assert.Equal("hqdn3d=4:3:6:4.5", filter);
+    }
+
+    [Fact]
+    public void Gate402_VideoDenoiseEnhancer_BuildsHighQualityNlmeansFilter()
+    {
+        var filter = VideoDenoiseEnhancer.BuildEnhanceFilterChain(denoise: true, sharpen: false, DenoisePreset.HighQualityNonLocalMeans);
+
+        Assert.Contains("nlmeans=s=1.0:p=7:r=15", filter);
+    }
+
+    [Fact]
+    public void Gate403_VideoDenoiseEnhancer_ChainsDenoiseAndSharpenFilters()
+    {
+        var filter = VideoDenoiseEnhancer.BuildEnhanceFilterChain(denoise: true, sharpen: true, DenoisePreset.FastTemporalSpatial);
+
+        Assert.Contains("hqdn3d=4:3:6:4.5", filter);
+        Assert.Contains("unsharp=5:5:0.8:5:5:0.4", filter);
+    }
+
+    [Fact]
+    public void Gate404_VideoDenoiseEnhancer_BuildsFullCommandLine_WithAudioCopy()
+    {
+        var cmd = VideoDenoiseEnhancer.BuildDenoiseCommandLine(
+            inputPath: "C:\\videos\\grainy.mp4",
+            outputPath: "C:\\videos\\enhanced.mp4",
+            denoise: true,
+            sharpen: true
+        );
+
+        Assert.Contains("-i \"C:\\videos\\grainy.mp4\"", cmd);
+        Assert.Contains("-vf \"hqdn3d=4:3:6:4.5,unsharp=5:5:0.8:5:5:0.4\"", cmd);
+        Assert.Contains("-c:v libx264 -crf 20 -preset fast -c:a copy", cmd);
+        Assert.EndsWith("\"C:\\videos\\enhanced.mp4\" -y", cmd);
+    }
+}