Fix CI failures: restore Temp in WriteOptions, fix import ordering

WriteOptions had AllowedSpecialFolders.Temp removed on the assumption
that only ConfigurationFileProvider used it. AwsS3SyncApplyStrategy
also uses temp to stage files before S3 upload — restore Temp to
WriteOptions to fix the DocsSyncTests.TestApply integration failure.

Fix IMPORTS lint errors across all files that gained new Nullean.ScopedFileSystem
using directives during the ScopedFileSystem migration; dotnet format
reorders them into the expected alphabetical/grouped order.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: Mpdreamz

src/Elastic.Codex/Building/CodexBuildService.cs

@@ -5,7 +5,6 @@
 using System.Collections.Frozen;
 using System.IO.Abstractions;
 using System.Text.Json;
-using Nullean.ScopedFileSystem;
 using Elastic.Codex.Navigation;
 using Elastic.Codex.Page;
 using Elastic.Codex.Sourcing;
@@ -26,6 +25,7 @@
 using Elastic.Markdown.Exporters;
 using Elastic.Markdown.IO;
 using Microsoft.Extensions.Logging;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Codex.Building;
 

src/Elastic.Codex/CodexContext.cs

@@ -3,10 +3,10 @@
 // See the LICENSE file in the project root for more information
 
 using System.IO.Abstractions;
-using Nullean.ScopedFileSystem;
 using Elastic.Documentation.Configuration;
 using Elastic.Documentation.Configuration.Codex;
 using Elastic.Documentation.Diagnostics;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Codex;
 

src/Elastic.Codex/Indexing/CodexIndexService.cs

@@ -3,14 +3,14 @@
 // See the LICENSE file in the project root for more information
 
 using System.IO.Abstractions;
-using Nullean.ScopedFileSystem;
 using Elastic.Codex.Building;
 using Elastic.Codex.Sourcing;
 using Elastic.Documentation;
 using Elastic.Documentation.Configuration;
 using Elastic.Documentation.Isolated;
 using Elastic.Documentation.Services;
 using Microsoft.Extensions.Logging;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Codex.Indexing;
 

src/Elastic.Documentation.Configuration/BuildContext.cs

@@ -4,7 +4,6 @@
 
 using System.IO.Abstractions;
 using System.Reflection;
-using Nullean.ScopedFileSystem;
 using Elastic.Documentation;
 using Elastic.Documentation.Configuration.Assembler;
 using Elastic.Documentation.Configuration.Builder;
@@ -14,6 +13,7 @@
 using Elastic.Documentation.Configuration.Toc;
 using Elastic.Documentation.Configuration.Versions;
 using Elastic.Documentation.Diagnostics;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Documentation.Configuration;
 

src/Elastic.Documentation.Configuration/FileSystemFactory.cs

@@ -22,11 +22,13 @@ public static class FileSystemFactory
 
 	// Write options: same scope roots but no .git — nothing in the build output
 	// pipeline should ever write into the git repository metadata.
+	// Temp is allowed because deploy operations (e.g. S3 sync) stage files there.
 	private static readonly ScopedFileSystemOptions WriteOptions = new(
 		[Paths.WorkingDirectoryRoot.FullName, Paths.ApplicationData.FullName])
 	{
 		AllowedHiddenFolderNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase) { ".artifacts" },
-		AllowedHiddenFileNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase) { ".doc.state" }
+		AllowedHiddenFileNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase) { ".doc.state" },
+		AllowedSpecialFolders = AllowedSpecialFolder.Temp
 	};
 
 	// AppData-only options: for components that only access caches/state files.

src/Elastic.Documentation.Configuration/Toc/DocumentationSetFile.cs

@@ -3,11 +3,11 @@
 // See the LICENSE file in the project root for more information
 
 using System.IO.Abstractions;
-using Nullean.ScopedFileSystem;
 using Elastic.Documentation.Configuration.Products;
 using Elastic.Documentation.Configuration.Toc.DetectionRules;
 using Elastic.Documentation.Diagnostics;
 using Elastic.Documentation.Extensions;
+using Nullean.ScopedFileSystem;
 using YamlDotNet.Serialization;
 using static Elastic.Documentation.Configuration.SymlinkValidator;
 

src/Elastic.Documentation.LinkIndex/GitLinkIndexReader.cs

@@ -5,8 +5,8 @@
 using System.Diagnostics;
 using System.IO.Abstractions;
 using Elastic.Documentation.Configuration;
-using Nullean.ScopedFileSystem;
 using Elastic.Documentation.Links;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Documentation.LinkIndex;
 

src/Elastic.Documentation.Links/CrossLinks/CrossLinkFetcher.cs

@@ -7,10 +7,10 @@
 using System.IO.Abstractions;
 using System.Text.Json;
 using Elastic.Documentation.Configuration;
-using Nullean.ScopedFileSystem;
 using Elastic.Documentation.LinkIndex;
 using Elastic.Documentation.Serialization;
 using Microsoft.Extensions.Logging;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Documentation.Links.CrossLinks;
 

src/Elastic.Markdown/Myst/Directives/CsvInclude/CsvReader.cs

@@ -4,8 +4,8 @@
 
 using System.IO.Abstractions;
 using Elastic.Documentation.Configuration;
-using Nullean.ScopedFileSystem;
 using nietras.SeparatedValues;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Markdown.Myst.Directives.CsvInclude;
 

src/authoring/Elastic.Documentation.Refactor/FormatService.cs

@@ -3,14 +3,14 @@
 // See the LICENSE file in the project root for more information
 
 using System.IO.Abstractions;
-using Nullean.ScopedFileSystem;
 using Elastic.Documentation.Configuration;
 using Elastic.Documentation.Diagnostics;
 using Elastic.Documentation.Links.CrossLinks;
 using Elastic.Documentation.Refactor.Formatters;
 using Elastic.Documentation.Services;
 using Elastic.Markdown.IO;
 using Microsoft.Extensions.Logging;
+using Nullean.ScopedFileSystem;
 
 namespace Elastic.Documentation.Refactor;