Replace .sln with .slnx; drop IDE-template scaffolding

The tracked GraphicalTools.sln carried stale ProjectReferences to
local Terminal.Gui sources, breaking CI's `dotnet test` (which was
implicitly resolving the solution). Switch to the modern .slnx format
and track it directly so the solution is reviewable and small.

- Replace GraphicalTools.sln with GraphicalTools.slnx (5-line XML;
  lists the 3 real projects, no dead Terminal.Gui ProjectReferences)
- Stop ignoring .slnx and .vscode/; track them
- Remove tools/initDevEnvironment.ps1 and tools/ide/ — no longer
  needed; .slnx is small enough to track and VS Code workspace
  files are now the supported way to share dev config
- Add .vscode/{launch,tasks,extensions}.json:
  * launch.json: single coreclr profile with a pickString input for
    selecting one of the OCGV / Show-ObjectTree sample commands
  * tasks.json: build (Invoke-Build), test (zero-arg dotnet test
    auto-resolves the .slnx), clean
  * extensions.json: recommends C# Dev Kit + PowerShell

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: andyleejordan

.gitignore

@@ -4,11 +4,9 @@ bin/
 obj/
 publish/
 *.sln
-*.slnx
 
 # IDE support (keep locally, don't track)
 /.vs/
-/.vscode/
 *.user
 *.suo
 *.sln.DotSettings

.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+    "recommendations": [
+        "ms-dotnettools.csdevkit",
+        "ms-dotnettools.csharp",
+        "ms-vscode.powershell"
+    ]
+}

.vscode/launch.json

@@ -0,0 +1,40 @@
+{
+    // Single debug profile that prompts for a sample command at launch.
+    // Add new scenarios by appending an option to the "sampleCommand" input below.
+    "version": "0.2.0",
+    "inputs": [
+        {
+            "id": "sampleCommand",
+            "type": "pickString",
+            "description": "Sample command to run after importing the module",
+            "default": "Get-Process | Out-ConsoleGridView -Debug",
+            "options": [
+                "Get-Process | Out-ConsoleGridView -Debug",
+                "Get-Process | Select-Object ProcessName, Id, CPU | Out-ConsoleGridView -Debug -Filter com",
+                "Get-Process | Out-ConsoleGridView -MinUi",
+                "Get-Process | Select-Object ProcessName, Id, Handles, NPM, PM, WS, CPU | Out-ConsoleGridView",
+                "Get-ChildItem | Out-ConsoleGridView -OutputMode Single",
+                "Get-Process | Show-ObjectTree"
+            ]
+        }
+    ],
+    "configurations": [
+        {
+            "name": "ConsoleGuiTools",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "pwsh",
+            "args": [
+                "-NoProfile",
+                "-NoLogo",
+                "-NoExit",
+                "-Command",
+                "Import-Module ${workspaceFolder}/module/Microsoft.PowerShell.ConsoleGuiTools.psd1; ${input:sampleCommand}"
+            ],
+            "cwd": "${workspaceFolder}",
+            "console": "integratedTerminal",
+            "stopAtEntry": false
+        }
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,60 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "detail": "Build module via Invoke-Build (copies to ./module/)",
+            "type": "process",
+            "command": "pwsh",
+            "args": [
+                "-NoProfile",
+                "-Command",
+                "Invoke-Build Build"
+            ],
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "presentation": {
+                "reveal": "silent",
+                "panel": "shared",
+                "clear": true
+            },
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "test",
+            "detail": "Run xunit tests via dotnet test (resolves GraphicalTools.slnx)",
+            "type": "process",
+            "command": "dotnet",
+            "args": [
+                "test"
+            ],
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "group": {
+                "kind": "test",
+                "isDefault": true
+            },
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "clean",
+            "type": "process",
+            "command": "pwsh",
+            "args": [
+                "-NoProfile",
+                "-Command",
+                "Invoke-Build Clean"
+            ],
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "problemMatcher": []
+        }
+    ]
+}

GraphicalTools.sln

@@ -0,0 +1,5 @@
+<Solution>
+  <Project Path="src/Microsoft.PowerShell.ConsoleGuiTools/Microsoft.PowerShell.ConsoleGuiTools.csproj" />
+  <Project Path="src/Microsoft.PowerShell.OutGridView.Models/Microsoft.PowerShell.OutGridView.Models.csproj" />
+  <Project Path="test/Microsoft.PowerShell.ConsoleGuiTools.Tests/Microsoft.PowerShell.ConsoleGuiTools.Tests.csproj" />
+</Solution>