Add repo-assist.md for automated repository assistant (#551)

Author: xperiandri

.github/copilot-instructions.md

@@ -1,7 +1,8 @@
 # Project details
-F# 9
-C# 13
-.NET 8 and 9
+
+F# 10
+C# 14
+.NET 10
 Nullability checks enabled
 
 ## Shell operations
@@ -11,7 +12,8 @@ Always prefer installing PowerShell modules over installing CLI tools.
 
 ## GitHub operations
 
-Use `PowerShellForGitHub` PowerShell module for all GitHub operations. Never use GitHub CLI (`gh`) or any other CLI tool for GitHub.
+First of all use GitHub MCP tools.
+If no tool avaialble, use `PowerShellForGitHub` PowerShell module for all GitHub operations. Never use GitHub CLI (`gh`) or any other CLI tool for GitHub.
 
 ## Libraries we use
 
@@ -39,6 +41,7 @@ Prefer `voption` over `option`
 Prefer `task` CE over `async` CE
 
 This is how you define a non-default F# class constructor:
+
 ```fsharp
 type DerivedClass =
     inherit BaseClass
@@ -61,6 +64,7 @@ type DerivedClass =
 Always prefer F# class initializers over property assignment! **You absolutely must use F# class initializers instead of property assignment**!
 
 Having a class declaration:
+
 ``` F#
 type MyClass (someConstructorParam : string) =
     member ReadOnlyProperty = someConstructorParam
@@ -70,13 +74,15 @@ type MyClass (someConstructorParam : string) =
 ```
 
 The following excerpt of class creation is wrong:
+
 ``` F#
 let myClass = MyClass("some value")
 myClass.MutableProperty1 <- "new value"
 myClass.MutableProperty2 <- "new value"
 ```
 
 The following excerpt (uses initializer syntax) of class creation is right:
+
 ``` F#
 let myClass =
     MyClass(
@@ -93,9 +99,11 @@ let myClass =
 ## Coding instructions
 
 During the implementation, if you need some types or members defined in the other project but that project is not referenced, then:
+
 1. stop implementing the solution;
 2. respond with summary about what is needed and which project it is defined in;
 3. ask if you can add the reference before continuing coding.
+
 Never ever duplicate the code unless you got explicit confirmation that you are allowed to do so.
 
 ## Documentation and Naming

.github/workflows/copilot-setup-steps.yml

@@ -14,7 +14,7 @@ on:
 jobs:
   # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
   copilot-setup-steps:
-    runs-on: windows-2025
+    runs-on: ubuntu-latest
 
     # Set the permissions to the lowest permissions possible needed for your steps.
     # Copilot will be given its own token for its operations.