C# Dev Kit missing Command Palette commands and Run button doesn't work on Ubuntu 26.04 lts (F5 works)

### Extension

C# Dev Kit
C# extension

### VS Code

Version: 1.130.0 (Snap)
Commit: 1b6a188127eeaf9194f945eb6eb89a657e93c54c

OS:
Ubuntu 26.04 LTS
Linux 7.0.0-28-generic x64

.NET SDK:
10.0.x

### Problem

The project debugger works normally (F5), but the Run button in the editor does nothing for C# projects.

Additionally, expected C# commands are missing from the Command Palette.

For example, searching for:

C#:

does not show commands such as:

- C#: Restart Language Server
- C#: Select Project
- C#: Generate Assets

Instead, VS Code only shows unrelated "similar commands".

### What works

- IntelliSense
- Syntax highlighting
- F5 debugging
- Breakpoints
- dotnet run from terminal
- Single-file C# execution

### What doesn't work

- Editor Run (▶) button for C# project
- Missing C# Command Palette commands

### Steps to reproduce

1. Install Ubuntu 26.04 LTS.
2. Install VS Code (Snap).
3. Install the Microsoft C# and C# Dev Kit extensions.
4. Create a new console project using:
dotnet new console
5. Open the folder in VS Code.
6. Press the Run button.

### Expected

Run button starts the project.
C# commands appear in the Command Palette.

### Actual

Run button does nothing.
F5 still works.
C# commands are missing from the Command Palette.

### Additional information

I also tested:

- VS Code .deb package
- VS Code Snap package
- Fresh extension installation
- Fresh project
- Reinstalled Ubuntu

The behavior is identical.

Python projects work correctly in the same VS Code installation.

Reproduce the issue with a new console project in VS Code on Ubuntu, comparing the editor Run button and F5 while searching the Command Palette for the listed C# commands. Trace the C# Dev Kit and C# extension entry points involved in project running and command registration; done means the Run button launches the project and the expected commands appear.

Written by the indexing model from the issue text.