Fixes #5412. Migrate from .sln to .slnx and remove redundant solution files

.claude/agents/cleanup-agent.md

@@ -70,7 +70,7 @@ Successfully cleaned files meet:
 - Applies "Full Cleanup" profile from `Terminal.sln.DotSettings`
 - Uses `--include` parameter to target specific files
 - Respects all project code style settings
-- Command: `jb cleanupcode Terminal.sln --profile="Full Cleanup" --include="path/to/file.cs" --no-build`
+- Command: `jb cleanupcode Terminal.slnx --profile="Full Cleanup" --include="path/to/file.cs" --no-build`
 
 ### 3. Backing Field Reordering
 - Places backing fields immediately before their properties
@@ -118,7 +118,7 @@ The `--include` parameter **WORKS CORRECTLY** for single-file cleanup:
 
 ```powershell
 # Cleanup a single file
-jb cleanupcode Terminal.sln `
+jb cleanupcode Terminal.slnx `
     --profile="Full Cleanup" `
     --include="Terminal.Gui/Views/TableView/TableView.cs" `
     --no-build `
@@ -139,7 +139,7 @@ jb cleanupcode Terminal.sln `
 
 ```powershell
 # Inspect a single file for warnings
-jb inspectcode Terminal.sln `
+jb inspectcode Terminal.slnx `
     --output="inspect-report.xml" `
     --include="Terminal.Gui/Views/TableView/TableView.cs" `
     --severity=WARNING `

CONTRIBUTING.md

@@ -285,7 +285,7 @@ foreach (Rune rune in text.EnumerateRunes ())
 
 ### Root Directory Files
 
-- `Terminal.sln` - Main solution file
+- `Terminal.slnx` - Main solution file
 - `Terminal.sln.DotSettings` - ReSharper code style settings
 - `.editorconfig` - Code formatting rules (111KB, extensive)
 - `global.json` - .NET SDK version pinning

Examples/UICatalog/Scenarios/Notepad.cs

@@ -325,15 +325,15 @@ private void Quit ()
 
     /// <summary>
     ///     Walks up the directory tree from the current directory looking for the repository root
-    ///     (identified by Terminal.sln).
+    ///     (identified by Terminal.slnx).
     /// </summary>
     private static string? FindRepoRoot ()
     {
         DirectoryInfo? dir = new (Environment.CurrentDirectory);
 
         while (dir is { })
         {
-            if (File.Exists (Path.Combine (dir.FullName, "Terminal.sln")))
+            if (File.Exists (Path.Combine (dir.FullName, "Terminal.slnx")))
             {
                 return dir.FullName;
             }

Scripts/CleanupAgent.ps1

@@ -89,7 +89,7 @@ function Invoke-ReSharperCleanup {
 
     # Run cleanup on specific file using --include parameter
     # Note: May show exceptions in output, but cleanup still completes successfully
-    jb cleanupcode "$RepoRoot\Terminal.sln" `
+    jb cleanupcode "$RepoRoot\Terminal.slnx" `
         --profile="Full Cleanup" `
         --include="$relativePath" `
         --no-build `
@@ -115,7 +115,7 @@ function Get-ReSharperWarningCount {
 
     Write-Status "Running ReSharper InspectCode to count warnings..."
 
-    jb inspectcode "$RepoRoot\Terminal.sln" `
+    jb inspectcode "$RepoRoot\Terminal.slnx" `
         --output="$tempXml" `
         --include="$includeList" `
         --severity=WARNING `
@@ -149,7 +149,7 @@ function Get-BuildWarnings {
 
     Write-Status "Analyzing build warnings..."
 
-    $buildOutput = dotnet build "$RepoRoot\Terminal.sln" --no-restore --configuration Debug --verbosity normal 2>&1 | Out-String
+    $buildOutput = dotnet build "$RepoRoot\Terminal.slnx" --no-restore --configuration Debug --verbosity normal 2>&1 | Out-String
 
     if ($LASTEXITCODE -ne 0) {
         Write-Status "Build failed" "Red"
@@ -308,7 +308,7 @@ function Add-CWPTodoComments {
 function Invoke-RebuildSolution {
     Write-Status "Rebuilding solution..."
 
-    dotnet build "$RepoRoot\Terminal.sln" --no-restore --configuration Debug --verbosity quiet 2>&1 | Out-Null
+    dotnet build "$RepoRoot\Terminal.slnx" --no-restore --configuration Debug --verbosity quiet 2>&1 | Out-Null
 
     if ($LASTEXITCODE -ne 0) {
         Write-Status "Build failed" "Red"

Scripts/README.md

@@ -1,5 +1,5 @@
 ## Development and Design-Time PowerShell Modules
-This directory contains PowerShell modules for use when working with Terminal.sln
+This directory contains PowerShell modules for use when working with Terminal.slnx
 
 ### Purpose
 These modules will be modifed and extended as time goes on, whenever someone decides to add something to make life easier.

Scripts/Terminal.Gui.PowerShell.Core.psm1

@@ -1,8 +1,8 @@
 <#
   .SYNOPSIS
-  (Windows Only) Opens Visual Studio and loads Terminal.sln.
+  (Windows Only) Opens Visual Studio and loads Terminal.slnx.
   .DESCRIPTION
-  (Windows Only) Opens Visual Studio and loads Terminal.sln.
+  (Windows Only) Opens Visual Studio and loads Terminal.slnx.
   .PARAMETER SolutionFilePath
   (Optional) If specified, the path to the solution file. Typically unnecessary to supply this parameter.
   .INPUTS
@@ -31,9 +31,9 @@ Function Open-Solution {
 
 <#
   .SYNOPSIS
-  (Windows Only) Closes Visual Studio processes with Terminal.sln loaded.
+  (Windows Only) Closes Visual Studio processes with Terminal.slnx loaded.
   .DESCRIPTION
-  (Windows Only) Closes Visual Studio processes with Terminal.sln loaded by finding any VS processes launched with the solution file or with 'Terminal' in their main window titles.
+  (Windows Only) Closes Visual Studio processes with Terminal.slnx loaded by finding any VS processes launched with the solution file or with 'Terminal' in their main window titles.
   .INPUTS
   None
   .OUTPUTS
@@ -66,7 +66,7 @@ Function Set-PowerShellEnvironment {
   # Set up some common globals
   New-Variable -Name ScriptsDirectory -Value $PSScriptRoot -Option ReadOnly -Scope Global -Visibility Public
   New-Variable -Name RepositoryRootDirectory -Value (Join-Path -Resolve $ScriptsDirectory "..") -Option ReadOnly -Scope Global -Visibility Public
-  New-Variable -Name SolutionFilePath -Value (Join-Path -Resolve $RepositoryRootDirectory "Terminal.sln") -Option ReadOnly -Scope Global -Visibility Public
+  New-Variable -Name SolutionFilePath -Value (Join-Path -Resolve $RepositoryRootDirectory "Terminal.slnx") -Option ReadOnly -Scope Global -Visibility Public
   New-Variable -Name TerminalGuiProjectDirectory -Value (Join-Path -Resolve $RepositoryRootDirectory "Terminal.Gui") -Option ReadOnly -Scope Global -Visibility Public
   New-Variable -Name TerminalGuiProjectFilePath -Value (Join-Path -Resolve $TerminalGuiProjectDirectory "Terminal.Gui.csproj") -Option ReadOnly -Scope Global -Visibility Public