feat: establish legacy parity migration baseline

tests/MBN_STOCK_WEBVIEW.LegacyBridge.Tests/GlobalUsings.cs

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+global using Xunit;

tests/MBN_STOCK_WEBVIEW.LegacyBridge.Tests/LegacyBridgeProtocolTests.cs

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+using System.Text.Json;
+using MBN_STOCK_WEBVIEW.LegacyApplication;
+using MBN_STOCK_WEBVIEW.LegacyBridge;
+
+namespace MBN_STOCK_WEBVIEW.LegacyBridge.Tests;
+
+public sealed class LegacyBridgeProtocolTests
+{
+    [Fact]
+    public void ParseSearch_PreservesBlankEnterAndRejectsExtraAuthority()
+    {
+        Assert.True(LegacyBridgeProtocol.TryParseIntent(
+            "{\"type\":\"search-stocks\",\"payload\":{\"text\":\"\",\"trigger\":\"enter\"}}",
+            out var parsed,
+            out var error));
+        Assert.Null(error);
+        var search = Assert.IsType<LegacySearchStocksIntent>(parsed);
+        Assert.Equal(string.Empty, search.Text);
+        Assert.Equal(LegacySearchTrigger.Enter, search.Trigger);
+
+        Assert.False(LegacyBridgeProtocol.TryParseIntent(
+            "{\"type\":\"search-stocks\",\"payload\":{\"text\":\"삼성\",\"trigger\":\"button\",\"sceneCode\":\"5001\"}}",
+            out _,
+            out _));
+    }
+
+    [Fact]
+    public void ParsePointer_RequiresExactBoundedInput()
+    {
+        const string json =
+            "{\"type\":\"cut-pointer-down\",\"payload\":{\"physicalIndex\":1,\"control\":false,\"shift\":true,\"x\":20,\"y\":45,\"timestampMilliseconds\":1400}}";
+
+        Assert.True(LegacyBridgeProtocol.TryParseIntent(json, out var parsed, out _));
+        var pointer = Assert.IsType<LegacyCutPointerDownIntent>(parsed);
+        Assert.Equal(1, pointer.PhysicalIndex);
+        Assert.True(pointer.Shift);
+        Assert.Equal(1_400, pointer.TimestampMilliseconds);
+    }
+
+    [Theory]
+    [InlineData("https://legacy-parity.mbn.local/index.html", true)]
+    [InlineData("https://legacy-parity.mbn.local.evil/index.html", false)]
+    [InlineData("http://legacy-parity.mbn.local/index.html", false)]
+    [InlineData("file:///C:/index.html", false)]
+    public void TrustedSource_IsExactHttpsOrigin(string source, bool expected)
+    {
+        Assert.Equal(expected, LegacyBridgeProtocol.IsTrustedSource(source));
+    }
+
+    [Fact]
+    public void SerializedState_DoesNotExposeHiddenDbOrSceneAuthority()
+    {
+        var playlistRow = LegacyStockCutCatalog.CreatePlaylistRow(
+            "legacy-stock-00000001",
+            "삼성전자",
+            new LegacyStockIdentity(LegacyDomesticStockMarket.Kospi, "삼성전자", "005930"),
+            LegacyStockCutCatalog.Rows[1]);
+        var snapshot = new LegacyOperatorSnapshot(
+            1,
+            "삼성",
+            [new LegacyStockResultRow(0, "삼성전자")],
+            0,
+            [new LegacyCutViewRow(1, 2, "1열판기본_현재가", false, true)],
+            [playlistRow],
+            null,
+            string.Empty,
+            LegacyOperatorStatusKind.Neutral);
+
+        var json = LegacyBridgeProtocol.SerializeState(snapshot, isBusy: true);
+
+        Assert.DoesNotContain("005930", json, StringComparison.Ordinal);
+        Assert.DoesNotContain("5001", json, StringComparison.Ordinal);
+        Assert.DoesNotContain("rawCutLabel", json, StringComparison.Ordinal);
+
+        using var document = JsonDocument.Parse(json);
+        var payload = document.RootElement.GetProperty("payload");
+        Assert.Equal(
+            "삼성전자",
+            payload.GetProperty("searchResults")[0].GetProperty("displayName").GetString());
+        Assert.Equal(
+            "삼성전자",
+            payload.GetProperty("playlist")[0].GetProperty("stockName").GetString());
+        Assert.Equal(
+            "1열판기본_현재가",
+            payload.GetProperty("cutRows")[0].GetProperty("rawLabel").GetString());
+        Assert.True(payload.GetProperty("isBusy").GetBoolean());
+    }
+}

tests/MBN_STOCK_WEBVIEW.LegacyBridge.Tests/MBN_STOCK_WEBVIEW.LegacyBridge.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\MBN_STOCK_WEBVIEW.LegacyBridge\MBN_STOCK_WEBVIEW.LegacyBridge.csproj" />
+  </ItemGroup>
+
+</Project>