chore: Update to .NET 10 and refactor extensions (#70)

Author: sirkirby

.github/copilot-instructions.md

@@ -10,7 +10,7 @@
 ## Core Technology Stack
 
 ```text
-Language:     C# 12+ with .NET 9
+Language:     C# 14 with .NET 10
 CLI:          System.CommandLine 2.0-rc
 UI:           Spectre.Console 0.51.1
 CQRS:         MediatR 13.1.0

.github/workflows/pr-validation.yml

@@ -23,7 +23,7 @@ concurrency:
 
 # Environment variables available to all jobs
 env:
-  DOTNET_VERSION: '9.0.x'
+  DOTNET_VERSION: '10.0.x'
   # Maximum allowed coverage decrease (percentage points)
   # PRs that decrease coverage by more than this will fail
   MAX_COVERAGE_DECREASE: 0.5

.github/workflows/release.yml

@@ -188,7 +188,7 @@ jobs:
       - name: Setup .NET SDK
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '9.0.x'
+          dotnet-version: '10.0.x'
 
       - name: Restore dependencies
         run: dotnet restore

.gitignore

@@ -1,4 +1,4 @@
-# Ten Second Tom - .gitignore (C# / .NET 9 CLI)
+# Ten Second Tom - .gitignore (C# / .NET 10 CLI)
 # Reference base: GitHub's VisualStudio + Dotnet + macOS templates, trimmed & curated.
 # Only ignore what is safe to regenerate or machine/user specific.
 

.specify/memory/constitution.md

@@ -3,8 +3,8 @@
 ## Core Principles
 
 ### I. Modern .NET & Idiomatic C#
-- **Target**: .NET 9 with C# 12+ modern features
-- **Required Features**: File-scoped namespaces, primary constructors, records, required properties, collection expressions
+- **Target**: .NET 10 with C# 14 modern features
+- **Required Features**: File-scoped namespaces, primary constructors, records, required properties, collection expressions, extension members, field-backed properties
 - **Pattern**: Nullable reference types enabled project-wide
 - **No Legacy Code**: Avoid outdated patterns (traditional constructors, verbose property initialization)
 
@@ -147,7 +147,7 @@ public static class [UseCase]
 ## Technology Stack
 
 ### Required Dependencies
-- **.NET 9** - Latest LTS runtime
+- **.NET 10** - Latest LTS runtime
 - **System.CommandLine 2.0-rc** - CLI framework
 - **MediatR 13.1+** - CQRS implementation
 - **FluentValidation 12.0+** - Input validation

.vscode/launch.json

@@ -1,6 +1,6 @@
 {
     // Ten Second Tom debugging configurations.
-    // Modern .NET 9 CLI: we always launch the project (build on debug) and supply useful environment variables.
+    // Modern .NET 10 CLI: we always launch the project (build on debug) and supply useful environment variables.
     // DOTNET_ENVIRONMENT drives loading of appsettings.{Environment}.json via EnvironmentHelper.
     // You can override LLM provider/model per configuration without changing persisted config.
     "version": "0.2.0",
@@ -10,7 +10,7 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/src/bin/Debug/net9.0/TenSecondTom.dll",
+            "program": "${workspaceFolder}/src/bin/Debug/net10.0/TenSecondTom.dll",
             "args": [],
             "cwd": "${workspaceFolder}/src",
             "console": "integratedTerminal",
@@ -32,7 +32,7 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/src/bin/Debug/net9.0/TenSecondTom.dll",
+            "program": "${workspaceFolder}/src/bin/Debug/net10.0/TenSecondTom.dll",
             "args": ["today"],
             "cwd": "${workspaceFolder}/src",
             "console": "integratedTerminal",
@@ -48,7 +48,7 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/src/bin/Debug/net9.0/TenSecondTom.dll",
+            "program": "${workspaceFolder}/src/bin/Debug/net10.0/TenSecondTom.dll",
             "args": ["this-week", "--json"],
             "cwd": "${workspaceFolder}/src",
             "console": "integratedTerminal",
@@ -67,7 +67,7 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/src/bin/Debug/net9.0/TenSecondTom.dll",
+            "program": "${workspaceFolder}/src/bin/Debug/net10.0/TenSecondTom.dll",
             "args": ["setup", "--force"],
             "cwd": "${workspaceFolder}/src",
             "console": "integratedTerminal",
@@ -83,7 +83,7 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/src/bin/Debug/net9.0/TenSecondTom.dll",
+            "program": "${workspaceFolder}/src/bin/Debug/net10.0/TenSecondTom.dll",
             "args": ["today"],
             "cwd": "${workspaceFolder}/src",
             "console": "integratedTerminal",
@@ -98,9 +98,9 @@
             "type": "coreclr",
             "request": "launch",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/src/bin/Debug/net9.0/TenSecondTom.dll",
+            "program": "${workspaceFolder}/src/bin/Debug/net10.0/TenSecondTom.dll",
             "args": ["transcribe"],
-            "cwd": "${workspaceFolder}/src/bin/Debug/net9.0",
+            "cwd": "${workspaceFolder}/src/bin/Debug/net10.0",
             "console": "integratedTerminal",
             "internalConsoleOptions": "neverOpen",
             "env": {

.vscode/tasks.json

@@ -1,5 +1,5 @@
 {
-  // VS Code task definitions for Ten Second Tom (.NET 9 CLI)
+  // VS Code task definitions for Ten Second Tom (.NET 10 CLI)
   // Provides an explicit 'build' task referenced by launch.json.
   // Additional tasks (test, publish) can be added later.
   "version": "2.0.0",

AGENTS.md

@@ -9,12 +9,12 @@
 
 ## Project Overview
 
-Ten Second Tom is a modern CLI application built with **C# and .NET 9**, following **Vertical Slice Architecture (VSA)** with the **Co-location Pattern**. All architectural principles are defined in the constitution.
+Ten Second Tom is a modern CLI application built with **C# and .NET 10**, following **Vertical Slice Architecture (VSA)** with the **Co-location Pattern**. All architectural principles are defined in the constitution.
 
 ## Core Technology Stack
 
 ```text
-Language:     C# 12+ with .NET 9
+Language:     C# 14 with .NET 10
 CLI:          System.CommandLine 2.0-rc
 UI:           Spectre.Console 0.51.1
 CQRS:         MediatR 13.1.0

CLAUDE.md

@@ -4,7 +4,7 @@
 
 ## Project Overview
 
-Ten Second Tom is a modern CLI application built with **C# and .NET 9**, following **Vertical Slice Architecture (VSA)** with strict adherence to the principles defined in the constitution.
+Ten Second Tom is a modern CLI application built with **C# and .NET 10**, following **Vertical Slice Architecture (VSA)** with strict adherence to the principles defined in the constitution.
 
 ## Quick Links
 
@@ -14,7 +14,7 @@ Ten Second Tom is a modern CLI application built with **C# and .NET 9**, followi
 ## Core Technology Stack
 
 ```text
-Language:     C# 12+ with .NET 9
+Language:     C# 14 with .NET 10
 CLI:          System.CommandLine 2.0-rc
 UI:           Spectre.Console 0.51.1
 CQRS:         MediatR 13.1.0

Makefile

@@ -9,7 +9,7 @@ extensions:
 
 dotnet: extensions
 	@echo "Building .NET Application..."
-	@dotnet build -f net9.0 src/TenSecondTom.csproj
+	@dotnet build -f net10.0 src/TenSecondTom.csproj
 
 clean:
 	@echo "Cleaning..."