feat(sdk): migrate to EventBus 2.0

Replace the legacy EventBase runtime with generated multi-bus bindings and explicit scheduling. Migrate app, data, network, demo, and mod consumers; add generated network-event registration and owner-scoped mod content overrides.

Tools/ShrinkModFixtureBuilder/Rebuild-ShrinkModFixtures.ps1

@@ -0,0 +1,43 @@
+[CmdletBinding()]
+param(
+    [string]$ProjectRoot
+)
+
+$ErrorActionPreference = 'Stop'
+
+if (-not $ProjectRoot) {
+    $ProjectRoot = Join-Path $PSScriptRoot '../..'
+}
+
+$resolvedProjectRoot = (Resolve-Path -LiteralPath $ProjectRoot).Path
+$runtimeProject = Join-Path $resolvedProjectRoot 'ShrinkModFramework.Runtime.csproj'
+$fixtureProject = Join-Path $PSScriptRoot 'ShrinkModFixtureBuilder.csproj'
+$fixtureOutputRoot = Join-Path $resolvedProjectRoot 'Temp/ShrinkModFixtureBuilder'
+$fixtureTargetRoot = Join-Path $resolvedProjectRoot 'Assets/Modules/ShrinkModFramework/Tests/Fixtures'
+
+dotnet build $runtimeProject /m:1 --nologo
+if ($LASTEXITCODE -ne 0) {
+    throw "ShrinkModFramework.Runtime build failed with exit code $LASTEXITCODE."
+}
+
+foreach ($variant in 'V1', 'V2', 'V3') {
+    $outputDirectory = Join-Path $fixtureOutputRoot $variant
+    $intermediateDirectory = Join-Path $fixtureOutputRoot "obj/$variant/"
+    dotnet build $fixtureProject /m:1 --nologo `
+        -p:FixtureVariant=$variant `
+        -p:BaseIntermediateOutputPath=$intermediateDirectory `
+        -p:OutputPath=$outputDirectory
+    if ($LASTEXITCODE -ne 0) {
+        throw "External fixture $variant build failed with exit code $LASTEXITCODE."
+    }
+
+    $source = Join-Path $outputDirectory 'ExternalFixture.Mod.dll'
+    $targetName = switch ($variant) {
+        'V1' { 'ExternalFixture.Mod.V1.dll.bytes' }
+        'V2' { 'ExternalFixture.Mod.V2.Failing.dll.bytes' }
+        'V3' { 'ExternalFixture.Mod.V3.dll.bytes' }
+    }
+    Copy-Item -LiteralPath $source -Destination (Join-Path $fixtureTargetRoot $targetName) -Force
+}
+
+Write-Host 'ShrinkModFramework external fixture DLLs rebuilt.'