fix: remove DEBUG-only task tracking from RebalanceScheduler and update solution to include CI/CD project

Author: Mykyta Zotov

.github/CICD_SETUP.md

@@ -30,6 +30,11 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SlidingWindowCache.Integrat
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SlidingWindowCache.Unit.Tests", "tests\SlidingWindowCache.Unit.Tests\SlidingWindowCache.Unit.Tests.csproj", "{906F9E4F-0EFA-4FE8-8DA2-DDECE22B7306}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "cicd", "cicd", "{9C6688E8-071B-48F5-9B84-4779B58822CC}"
+	ProjectSection(SolutionItems) = preProject
+		.github\workflows\slidingwindowcache.yml = .github\workflows\slidingwindowcache.yml
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -64,5 +69,6 @@ Global
 		{17AB54EA-D245-4867-A047-ED55B4D94C17} = {8C504091-1383-4EEB-879E-7A3769C3DF13}
 		{0023794C-FAD3-490C-96E3-448C68ED2569} = {8C504091-1383-4EEB-879E-7A3769C3DF13}
 		{906F9E4F-0EFA-4FE8-8DA2-DDECE22B7306} = {8C504091-1383-4EEB-879E-7A3769C3DF13}
+		{9C6688E8-071B-48F5-9B84-4779B58822CC} = {EB667A96-0E73-48B6-ACC8-C99369A59D0D}
 	EndGlobalSection
 EndGlobal

.github/workflows/README.md

@@ -45,14 +45,12 @@ internal sealed class RebalanceScheduler<TRange, TData, TDomain>
     private readonly TimeSpan _debounceDelay;
     private readonly ICacheDiagnostics _cacheDiagnostics;
 
-#if DEBUG
     /// <summary>
     /// Tracks the latest scheduled rebalance background Task for deterministic idle synchronization.
     /// Used by WaitForIdleAsync() to provide race-free testing infrastructure.
     /// This field exists only in DEBUG builds and has zero RELEASE overhead.
     /// </summary>
     private Task _idleTask = Task.CompletedTask;
-#endif
 
     /// <summary>
     /// Initializes a new instance of the <see cref="RebalanceScheduler{TRange,TData,TDomain}"/> class.
@@ -127,10 +125,8 @@ await ExecuteAfterAsync(
         // NOTE: Do NOT pass intentToken to Task.Run ^ - it should only be used inside the lambda
         // to ensure the try-catch properly handles all OperationCanceledExceptions
 
-#if DEBUG
         // Track the latest background task for deterministic idle synchronization (DEBUG-only)
         _idleTask = backgroundTask;
-#endif
     }
 
     /// <summary>