diff --git a/.editorconfig b/.editorconfig
index c04a279..2cd5f5b 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -9,7 +9,9 @@ charset = utf-8
 indent_style = space
 indent_size = 4
 tab_width = 4
-end_of_line = crlf
+# LF on every platform, matching the `* text=auto eol=lf` default in .gitattributes.
+# Overrides below must stay in step with the eol pins in that file.
+end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
 
@@ -17,7 +19,7 @@ trim_trailing_whitespace = true
 [*.{cs,csx,cake,fs,fsx,vb,vbx}]
 indent_style = tab
 
-file_header_template = Copyright (c) ktsu.dev\nAll rights reserved.\nLicensed under the MIT license.
+file_header_template = Copyright (c) 2023-2026 ktsu-dev contributors
 
 # Default severity for all .NET Code Style rules
 dotnet_analyzer_diagnostic.severity = error
@@ -503,4 +505,9 @@ indent_style = tab
 # Shell scripts
 [*.sh]
 end_of_line = lf
-indent_size = 2
\ No newline at end of file
+indent_size = 2
+
+# Windows batch scripts and Visual Studio solution files keep CRLF on every platform.
+# These match the eol=crlf pins in .gitattributes.
+[*.{cmd,bat,sln}]
+end_of_line = crlf
\ No newline at end of file
diff --git a/.gitattributes b/.gitattributes
index d67e40c..a0bea35 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -4,20 +4,25 @@
 # Git Line Endings            #
 ###############################
 
-# Set default behaviour to automatically normalize line endings.
-* text=auto
+# Normalize all text files to LF in the repository, and check them out as LF on every
+# platform. The explicit eol overrides each machine's core.autocrlf, so the working tree
+# is byte-identical on Windows, Linux and macOS. This must stay in step with the
+# end_of_line settings in .editorconfig.
+* text=auto eol=lf
 
-# csharp files to match .editorconfig
-*.cs text eol=crlf
+# Force bash scripts to always use LF line endings so that if a repo is accessed
+# in Unix via a file share from Windows, the scripts will work. Redundant with the
+# default above, kept explicit because these files break outright with CRLF.
+*.sh text eol=lf
 
 # Force batch scripts to always use CRLF line endings so that if a repo is accessed
 # in Windows via a file share from Linux, the scripts will work.
-*.{cmd,[cC][mM][dD]} text eol=crlf
-*.{bat,[bB][aA][tT]} text eol=crlf
+*.cmd text eol=crlf
+*.bat text eol=crlf
 
-# Force bash scripts to always use LF line endings so that if a repo is accessed
-# in Unix via a file share from Windows, the scripts will work.
-*.sh text eol=lf
+# Visual Studio rewrites solution files with CRLF regardless of the checkout, so pin
+# them to avoid a spurious whole-file diff every time the solution is opened.
+*.sln text eol=crlf
 
 ###############################
 # Git Large File System (LFS) #
diff --git a/.runsettings b/.runsettings
index 3c3169d..9bd9f05 100644
--- a/.runsettings
+++ b/.runsettings
@@ -1,25 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RunSettings>
-  <!-- Specify a deterministic output directory -->
   <RunConfiguration>
-    <ResultsDirectory>.\coverage</ResultsDirectory>
+    <ResultsDirectory>TestResults</ResultsDirectory>
   </RunConfiguration>
-  <!-- Specify a deterministic output directory -->
-  <RunConfiguration>
-    <ResultsDirectory>.\coverage</ResultsDirectory>
-  </RunConfiguration>
-
-  <!-- Configuration for coverlet data collector -->
-  <DataCollectionRunSettings>
-    <DataCollectors>
-      <DataCollector friendlyName="XPlat Code Coverage" uri="datacollector://Microsoft/CodeCoverage/2.0" assemblyQualifiedName="coverlet.collector.DataCollectors.CoverletInProcDataCollector, coverlet.collector, Version=6.0.4.0, Culture=neutral, PublicKeyToken=null">
-        <Configuration>
-          <Format>opencover</Format>
-          <OutputPath>coverage.opencover.xml</OutputPath>
-          <Exclude>[*Test*]*,[*Tests*]*</Exclude>
-          <ExcludeByFile>**/obj/**/*</ExcludeByFile>
-        </Configuration>
-      </DataCollector>
-    </DataCollectors>
-  </DataCollectionRunSettings>
 </RunSettings>
diff --git a/IntervalAction.Test/IntervalActionTests.cs b/IntervalAction.Test/IntervalActionTests.cs
index 05d1713..635413e 100644
--- a/IntervalAction.Test/IntervalActionTests.cs
+++ b/IntervalAction.Test/IntervalActionTests.cs
@@ -1,6 +1,4 @@
-// Copyright (c) ktsu.dev
-// All rights reserved.
-// Licensed under the MIT license.
+// Copyright (c) 2023-2026 ktsu-dev contributors
 
 [assembly: DoNotParallelize]
 
diff --git a/IntervalAction/AssemblyInfo.cs b/IntervalAction/AssemblyInfo.cs
index 633f8f9..cf8517e 100644
--- a/IntervalAction/AssemblyInfo.cs
+++ b/IntervalAction/AssemblyInfo.cs
@@ -1,6 +1,4 @@
-// Copyright (c) ktsu.dev
-// All rights reserved.
-// Licensed under the MIT license.
+// Copyright (c) 2023-2026 ktsu-dev contributors
 
 using System.Runtime.CompilerServices;
 
diff --git a/IntervalAction/IntervalAction.cs b/IntervalAction/IntervalAction.cs
index 721f7f4..84a47ed 100644
--- a/IntervalAction/IntervalAction.cs
+++ b/IntervalAction/IntervalAction.cs
@@ -1,6 +1,4 @@
-// Copyright (c) ktsu.dev
-// All rights reserved.
-// Licensed under the MIT license.
+// Copyright (c) 2023-2026 ktsu-dev contributors
 
 namespace ktsu.IntervalAction;
 
diff --git a/IntervalAction/IntervalActionOptions.cs b/IntervalAction/IntervalActionOptions.cs
index c55420c..7aace6c 100644
--- a/IntervalAction/IntervalActionOptions.cs
+++ b/IntervalAction/IntervalActionOptions.cs
@@ -1,6 +1,4 @@
-// Copyright (c) ktsu.dev
-// All rights reserved.
-// Licensed under the MIT license.
+// Copyright (c) 2023-2026 ktsu-dev contributors
 
 namespace ktsu.IntervalAction;
 
diff --git a/global.json b/global.json
index 15c86b6..39f7683 100644
--- a/global.json
+++ b/global.json
@@ -5,15 +5,15 @@
   },
   "msbuild-sdks": {
     "MSTest.Sdk": "4.3.3",
-    "ktsu.Sdk": "2.18.0",
-    "ktsu.Sdk.ConsoleApp": "2.18.0",
-    "ktsu.Sdk.Tool": "2.18.0",
-    "ktsu.Sdk.App": "2.18.0",
-    "ktsu.Sdk.Windows": "2.18.0",
-    "ktsu.Sdk.Linux": "2.18.0",
-    "ktsu.Sdk.macOS": "2.18.0",
-    "ktsu.Sdk.iOS": "2.18.0",
-    "ktsu.Sdk.Android": "2.18.0"
+    "ktsu.Sdk": "2.21.1",
+    "ktsu.Sdk.ConsoleApp": "2.21.1",
+    "ktsu.Sdk.Tool": "2.21.1",
+    "ktsu.Sdk.App": "2.21.1",
+    "ktsu.Sdk.Windows": "2.21.1",
+    "ktsu.Sdk.Linux": "2.21.1",
+    "ktsu.Sdk.macOS": "2.21.1",
+    "ktsu.Sdk.iOS": "2.21.1",
+    "ktsu.Sdk.Android": "2.21.1"
   },
   "test": {
     "runner": "Microsoft.Testing.Platform"