feat: upgrade to .NET 9 / C# 13, latest packages & actions, add Copilot instructions (#2)

2026-03-11 16:00:11 +00:00 · 2026-03-06 02:39:56 +02:00
parent 7639eb1cfc
commit 76ff24b34c
12 changed files with 224 additions and 596 deletions
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -0,0 +1,94 @@
+# GitHub Copilot Instructions for HihaArvio
+
+## Authoritative Reference
+
+**CLAUDE.md is the single source of truth for this repository.**
+
+All guidelines, architecture decisions, implementation requirements, and coding standards defined in [`CLAUDE.md`](../CLAUDE.md) at the repository root MUST be followed without exception. CLAUDE.md takes absolute precedence over any other instruction, convention, or assumption.
+
+Before suggesting, generating, or reviewing any code for this repository, read and internalize CLAUDE.md in its entirety.
+
+## Non-Negotiable Rules
+
+The following rules are derived from CLAUDE.md and additional Copilot-specific code quality guidelines. All MUST be enforced in every interaction:
+
+### Language & Framework
+
+- **Target framework:** .NET 9, using C# 13
+- **UI framework:** .NET MAUI (multi-platform)
+- **Nullable reference types MUST be enabled** across all projects
+- **All compiler warnings MUST be treated as errors** (`<TreatWarningsAsErrors>true</TreatWarningsAsErrors>`)
+- Language version MUST be set to `13` in all project files
+
+### Architecture (MVVM – Strict Separation)
+
+- **Models**: Plain data objects only — no business logic
+- **ViewModels**: All presentation logic — 100% testable without UI dependencies
+- **Views**: Thin layer — data binding only, minimal code-behind
+- **Services**: All business logic and infrastructure concerns
+
+### Dependency Injection
+
+- All services MUST be injected via constructor — never use the service locator pattern or `new` inside ViewModels
+- Register all services in `MauiProgram.cs`
+- Platform-specific implementations use `#if IOS`, `#elif WINDOWS || MACCATALYST`
+
+### Testing Requirements
+
+- Test coverage MUST be ≥ 95 % (measured by Coverlet; threshold enforcement is a future CI/CD enhancement)
+- Testing stack: **xUnit + NSubstitute + FluentAssertions**
+- All tests MUST use deterministic, seeded randomness — never `Random.Shared`
+- All external dependencies (sensors, database, file system) MUST be mocked
+- Use test-data builders for complex objects
+
+### Security
+
+- Estimate selection MUST use `System.Security.Cryptography.RandomNumberGenerator` — never `System.Random`
+- No external data transmission — all data is stored locally only
+- Request the minimum required platform permissions
+
+### Commit & Code Quality
+
+- Use **semantic / conventional commit** messages (e.g. `feat:`, `fix:`, `chore:`, `docs:`, `test:`, `refactor:`)
+- Make **atomic commits** — one logical change per commit
+- Run all linting and build tools; automatically fix all reported issues before committing
+- Follow the `.editorconfig` rules present in the repository root
+
+## Technology Stack (Current Versions)
+
+| Component | Version |
+|---|---|
+| .NET SDK | 9.0.x |
+| C# Language | 13 |
+| Microsoft.Maui.Controls | 9.0.120 |
+| Microsoft.Maui.Controls.Compatibility | 9.0.120 |
+| CommunityToolkit.Mvvm | 8.4.0 |
+| SQLite (sqlite-net-pcl) | 1.9.172 |
+| SQLitePCLRaw.bundle_green | 2.1.11 |
+| Microsoft.Extensions.Logging.Debug | 9.0.13 |
+| xUnit | 2.9.3 |
+| xunit.runner.visualstudio | 2.8.2 |
+| Microsoft.NET.Test.Sdk | 18.3.0 |
+| NSubstitute | 5.3.0 |
+| FluentAssertions | 8.8.0 |
+| coverlet.collector | 8.0.0 |
+
+## Key Files
+
+| File | Purpose |
+|---|---|
+| `CLAUDE.md` | **Authoritative project guide** — always read first |
+| `spec.md` | Formal RFC 2119 requirements (MUST / SHALL / REQUIRED) |
+| `docs/plans/2025-11-18-hiha-arvio-design.md` | Validated architecture decisions |
+| `src/HihaArvio/HihaArvio.csproj` | Main MAUI project |
+| `tests/HihaArvio.Tests/HihaArvio.Tests.csproj` | Unit & integration tests |
+| `.editorconfig` | Code style enforcement |
+
+## Easter Egg — Never Expose
+
+The hidden humorous mode triggered by shaking for > 15 seconds MUST NOT have any visible UI indication and MUST NOT be mentioned in any UI element, setting, or documentation visible to users.
+
+## When in Doubt
+
+If there is any ambiguity, consult **CLAUDE.md** and **spec.md** — in that order.  
+Do not invent architecture, add dependencies, or change platform targets without explicit justification grounded in those documents.
--- a/.github/workflows/README.md
+++ b/.github/workflows/README.md
@@ -12,9 +12,9 @@ This directory contains the CI/CD workflows for HihaArvio.

 **What it does**:
 - Runs on Ubuntu (fastest, cheapest for tests)
- Sets up .NET 8.0
- Builds the solution for `net8.0` target
- Runs all 189 xUnit tests
+- Sets up .NET 9.0
+- Restores and builds `tests/HihaArvio.Tests/HihaArvio.Tests.csproj` for the `net9.0` target
+- Runs all xUnit tests in `tests/HihaArvio.Tests/HihaArvio.Tests.csproj`
 - Publishes test results and coverage reports
 - Uploads test artifacts for review

@@ -32,8 +32,8 @@ This directory contains the CI/CD workflows for HihaArvio.
 **Purpose**: Build the application for all supported platforms.

 **What it does**:
- **iOS Job**: Builds for iOS 15.0+ on macOS-14 runner
- **macOS Catalyst Job**: Builds for macOS 12.0+ on macOS-14 runner
+- **iOS Job**: Builds for iOS 15.0+ on macOS-26 runner
+- **macOS Catalyst Job**: Builds for macOS 12.0+ on macOS-26 runner
 - Installs .NET MAUI workload
 - Builds without code signing (for CI verification)
 - Uploads build artifacts (`.app` bundles)
@@ -98,16 +98,16 @@ Tags containing `alpha`, `beta`, or `rc` are marked as pre-releases.

 ### Running Tests Locally
 ```bash
-dotnet test HihaArvio.sln -f net8.0
+dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj -f net9.0
 ```

 ### Building Locally
 ```bash
 # iOS
-dotnet build src/HihaArvio/HihaArvio.csproj -f net8.0-ios -c Release
+dotnet build src/HihaArvio/HihaArvio.csproj -f net9.0-ios -c Release

 # macOS Catalyst
-dotnet build src/HihaArvio/HihaArvio.csproj -f net8.0-maccatalyst -c Release
+dotnet build src/HihaArvio/HihaArvio.csproj -f net9.0-maccatalyst -c Release
 ```

 ### Creating a Release
@@ -146,16 +146,16 @@ For signed releases, add:

 ### Runner Requirements
 - **Test**: `ubuntu-latest` (any Linux runner)
- **Build**: `macos-14` (Apple Silicon runner for MAUI workloads)
- **Publish**: `macos-14` (Apple Silicon runner for MAUI workloads)
+- **Build**: `macos-26` (Apple Silicon runner with Xcode 26 for MAUI workloads)
+- **Publish**: `macos-26` (Apple Silicon runner with Xcode 26 for MAUI workloads)

 ### External Actions Used
- `actions/checkout@v4` - Checkout repository
- `actions/setup-dotnet@v4` - Setup .NET SDK
- `actions/upload-artifact@v4` - Upload build artifacts
- `actions/create-release@v1` - Create GitHub releases
- `actions/upload-release-asset@v1` - Upload release assets
- `dorny/test-reporter@v1` - Generate test reports
+- `actions/checkout@v6.0.2` - Checkout repository
+- `actions/setup-dotnet@v5.2.0` - Setup .NET SDK
+- `actions/upload-artifact@v7.0.0` - Upload build artifacts
+- `softprops/action-gh-release@v2.5.0` - Create GitHub releases
+- `actions/download-artifact@v8.0.0` - Download build artifacts for release
+- `dorny/test-reporter@v2.6.0` - Generate test reports

 ---

@@ -164,7 +164,7 @@ For signed releases, add:
 ### Tests Failing
 Check test output in workflow logs. Run locally with:
 ```bash
-dotnet test HihaArvio.sln -f net8.0 --verbosity detailed
+dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj -f net9.0 --verbosity detailed
 ```

 ### Build Failing
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,64 +10,74 @@ on:
 jobs:
  build-ios:
    name: Build iOS
-    runs-on: macos-latest
+    runs-on: macos-26
    permissions:
      contents: read
      actions: write

    steps:
    - name: Checkout code
-      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

    - name: Setup .NET
-      uses: actions/setup-dotnet@d4c94342e560b34958eacfc5d055d21461ed1c5d # v5.0.0
+      uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5.2.0
      with:
-        dotnet-version: '8.0.x'
+        dotnet-version: '9.0.x'
+
+    - name: Select Xcode version
+      uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
+      with:
+        xcode-version: '26.0'

    - name: Restore workloads
      run: dotnet workload restore src/HihaArvio/HihaArvio.csproj

    - name: Build iOS
-      run: dotnet build src/HihaArvio/HihaArvio.csproj -f net8.0-ios -c Release /p:ArchiveOnBuild=false /p:EnableCodeSigning=false
+      run: dotnet build src/HihaArvio/HihaArvio.csproj -f net9.0-ios -c Release /p:ArchiveOnBuild=false /p:EnableCodeSigning=false

    - name: Upload iOS build artifacts
-      uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
      with:
        name: ios-build
        path: |
-          src/HihaArvio/bin/Release/net8.0-ios/**/*.app
-          src/HihaArvio/bin/Release/net8.0-ios/**/*.ipa
+          src/HihaArvio/bin/Release/net9.0-ios/**/*.app
+          src/HihaArvio/bin/Release/net9.0-ios/**/*.ipa
        retention-days: 7

  build-maccatalyst:
    name: Build macOS Catalyst
-    runs-on: macos-latest
+    runs-on: macos-26
    permissions:
      contents: read
      actions: write

    steps:
    - name: Checkout code
-      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

    - name: Setup .NET
-      uses: actions/setup-dotnet@d4c94342e560b34958eacfc5d055d21461ed1c5d # v5.0.0
+      uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5.2.0
      with:
-        dotnet-version: '8.0.x'
+        dotnet-version: '9.0.x'
+
+    - name: Select Xcode version
+      uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
+      with:
+        xcode-version: '26.0'

    - name: Restore workloads
      run: dotnet workload restore src/HihaArvio/HihaArvio.csproj

    - name: Build macOS Catalyst
-      run: dotnet build src/HihaArvio/HihaArvio.csproj -f net8.0-maccatalyst -c Release /p:ArchiveOnBuild=false /p:EnableCodeSigning=false
+      run: dotnet build src/HihaArvio/HihaArvio.csproj -f net9.0-maccatalyst -c Release /p:ArchiveOnBuild=false /p:EnableCodeSigning=false

    - name: Upload macOS build artifacts
-      uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
      with:
        name: maccatalyst-build
        path: |
-          src/HihaArvio/bin/Release/net8.0-maccatalyst/**/*.app
-          src/HihaArvio/bin/Release/net8.0-maccatalyst/**/*.pkg
+          src/HihaArvio/bin/Release/net9.0-maccatalyst/**/*.app
+          src/HihaArvio/bin/Release/net9.0-maccatalyst/**/*.pkg
        retention-days: 7

  build-status:
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -12,19 +12,19 @@ on:
        type: string

 env:
-  DOTNET_VERSION: '8.0.x'
+  DOTNET_VERSION: '9.0.x'

 jobs:
  build-ios:
    name: Build iOS
-    runs-on: macos-latest
+    runs-on: macos-26
    permissions:
      contents: read
      actions: write

    steps:
    - name: Checkout code
-      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

    - name: Get version
      id: get_version
@@ -36,17 +36,22 @@ jobs:
        fi

    - name: Setup .NET
-      uses: actions/setup-dotnet@d4c94342e560b34958eacfc5d055d21461ed1c5d # v5.0.0
+      uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5.2.0
      with:
        dotnet-version: ${{ env.DOTNET_VERSION }}

+    - name: Select Xcode version
+      uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
+      with:
+        xcode-version: '26.0'
+
    - name: Restore workloads
      run: dotnet workload restore src/HihaArvio/HihaArvio.csproj

    - name: Build iOS Release
      run: |
        dotnet publish src/HihaArvio/HihaArvio.csproj \
-          -f net8.0-ios \
+          -f net9.0-ios \
          -c Release \
          /p:ApplicationDisplayVersion=${{ steps.get_version.outputs.version }} \
          /p:ApplicationVersion=${{ github.run_number }} \
@@ -55,7 +60,7 @@ jobs:

    - name: Create iOS artifact archive
      run: |
-        cd src/HihaArvio/bin/Release/net8.0-ios
+        cd src/HihaArvio/bin/Release/net9.0-ios
        # Find the .app bundle (it's in a subdirectory like iossimulator-arm64 or ios-arm64)
        APP_PATH=$(find . -name "*.app" -type d | head -n 1)
        if [ -z "$APP_PATH" ]; then
@@ -66,7 +71,7 @@ jobs:
        mv HihaArvio-iOS-${{ steps.get_version.outputs.version }}.zip ${{ github.workspace }}/

    - name: Upload iOS artifact
-      uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
      with:
        name: ios-release
        path: HihaArvio-iOS-${{ steps.get_version.outputs.version }}.zip
@@ -74,14 +79,14 @@ jobs:

  build-maccatalyst:
    name: Build macOS
-    runs-on: macos-latest
+    runs-on: macos-26
    permissions:
      contents: read
      actions: write

    steps:
    - name: Checkout code
-      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

    - name: Get version
      id: get_version
@@ -93,17 +98,22 @@ jobs:
        fi

    - name: Setup .NET
-      uses: actions/setup-dotnet@d4c94342e560b34958eacfc5d055d21461ed1c5d # v5.0.0
+      uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5.2.0
      with:
        dotnet-version: ${{ env.DOTNET_VERSION }}

+    - name: Select Xcode version
+      uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
+      with:
+        xcode-version: '26.0'
+
    - name: Restore workloads
      run: dotnet workload restore src/HihaArvio/HihaArvio.csproj

    - name: Build macOS Catalyst Release
      run: |
        dotnet publish src/HihaArvio/HihaArvio.csproj \
-          -f net8.0-maccatalyst \
+          -f net9.0-maccatalyst \
          -c Release \
          /p:ApplicationDisplayVersion=${{ steps.get_version.outputs.version }} \
          /p:ApplicationVersion=${{ github.run_number }} \
@@ -112,7 +122,7 @@ jobs:

    - name: Create macOS artifact archive
      run: |
-        cd src/HihaArvio/bin/Release/net8.0-maccatalyst
+        cd src/HihaArvio/bin/Release/net9.0-maccatalyst
        # Find the .app bundle (it's in a subdirectory like maccatalyst-x64 or maccatalyst-arm64)
        APP_PATH=$(find . -name "*.app" -type d | head -n 1)
        if [ -z "$APP_PATH" ]; then
@@ -123,7 +133,7 @@ jobs:
        mv HihaArvio-macOS-${{ steps.get_version.outputs.version }}.zip ${{ github.workspace }}/

    - name: Upload macOS artifact
-      uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
      with:
        name: maccatalyst-release
        path: HihaArvio-macOS-${{ steps.get_version.outputs.version }}.zip
@@ -140,7 +150,7 @@ jobs:

    steps:
    - name: Checkout code
-      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
      with:
        fetch-depth: 0

@@ -172,17 +182,17 @@ jobs:
        fi

    - name: Download iOS artifact
-      uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6.0.0
+      uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
      with:
        name: ios-release

    - name: Download macOS artifact
-      uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6.0.0
+      uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
      with:
        name: maccatalyst-release

    - name: Create Release
-      uses: softprops/action-gh-release@5be0e66d93ac7ed76da52eca8bb058f665c3a5fe # v2.4.2
+      uses: softprops/action-gh-release@a06a81a03ee405af7f2048a818ed3f03bbf83c7b # v2.5.0
      with:
        tag_name: ${{ github.event_name == 'workflow_dispatch' && format('v{0}', github.event.inputs.version) || github.ref_name }}
        name: Release ${{ steps.get_version.outputs.version }}
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,21 +17,21 @@ jobs:

    steps:
    - name: Checkout code
-      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

    - name: Setup .NET
-      uses: actions/setup-dotnet@d4c94342e560b34958eacfc5d055d21461ed1c5d # v5.0.0
+      uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5.2.0
      with:
-        dotnet-version: '8.0.x'
+        dotnet-version: '9.0.x'

    - name: Restore dependencies
-      run: dotnet restore tests/HihaArvio.Tests/HihaArvio.Tests.csproj /p:TargetFrameworks=net8.0
+      run: dotnet restore tests/HihaArvio.Tests/HihaArvio.Tests.csproj /p:TargetFrameworks=net9.0

    - name: Build test project
-      run: dotnet build tests/HihaArvio.Tests/HihaArvio.Tests.csproj --configuration Release --no-restore /p:TargetFrameworks=net8.0
+      run: dotnet build tests/HihaArvio.Tests/HihaArvio.Tests.csproj --configuration Release --no-restore /p:TargetFrameworks=net9.0

    - name: Run tests with coverage
-      run: dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj --configuration Release --no-build --verbosity normal /p:TargetFrameworks=net8.0 --collect:"XPlat Code Coverage" --logger "trx;LogFileName=test-results.trx"
+      run: dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj --configuration Release --no-build --verbosity normal /p:TargetFrameworks=net9.0 --collect:"XPlat Code Coverage" --logger "trx;LogFileName=test-results.trx"

    - name: Install ReportGenerator
      run: dotnet tool install --global dotnet-reportgenerator-globaltool
@@ -43,14 +43,14 @@ jobs:
      run: |
        # Extract and display line coverage percentage
        COVERAGE=$(grep -oP 'Line coverage: \K[\d.]+' coverage/Summary.txt | head -1)
-        echo "📊 Code coverage for net8.0 target: ${COVERAGE}%"
+        echo "📊 Code coverage for net9.0 target: ${COVERAGE}%"
        echo ""
        echo "Note: Multi-target MAUI projects cannot achieve full coverage on Linux runners."
-        echo "Platform-specific code (iOS/macOS) is excluded when building net8.0 only."
+        echo "Platform-specific code (iOS/macOS) is excluded when building net9.0 only."
        echo "Full coverage measurement requires macOS runners with all target frameworks."

    - name: Upload coverage report
-      uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
      if: always()
      with:
        name: coverage-report
@@ -58,7 +58,7 @@ jobs:
        retention-days: 30

    - name: Publish test results
-      uses: dorny/test-reporter@dc3a92680fcc15842eef52e8c4606ea7ce6bd3f3 # v2.1.1
+      uses: dorny/test-reporter@3d76b34a4535afbd0600d347b09a6ee5deb3ed7f # v2.6.0
      if: always()
      with:
        name: Test Results
@@ -67,7 +67,7 @@ jobs:
        fail-on-error: true

    - name: Upload test results
-      uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
      if: always()
      with:
        name: test-results
--- a/.gitignore
+++ b/.gitignore
@@ -44,6 +44,7 @@ _ReSharper*/
 *.trx
 *.coverage
 *.coveragexml
+**/TestResults/

 # NuGet Packages
 *.nupkg
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co

 ## Project Overview

-Hiha-Arvio (Finnish: "Sleeve Estimate") is a .NET 8 MAUI cross-platform application that generates semi-random time estimates based on physical shake input (accelerometer on mobile, mouse movement on desktop). This is a humor app for "pulling an estimate from your sleeve."
+Hiha-Arvio (Finnish: "Sleeve Estimate") is a .NET 9 MAUI cross-platform application that generates semi-random time estimates based on physical shake input (accelerometer on mobile, mouse movement on desktop). This is a humor app for "pulling an estimate from your sleeve."

 **Platforms (in priority order):** iOS (primary) → Web (Blazor) → macOS

@@ -41,8 +41,8 @@ Hiha-Arvio (Finnish: "Sleeve Estimate") is a .NET 8 MAUI cross-platform applicat

 ## Technology Stack

- **Framework:** .NET 8 MAUI (LTS)
- **Language:** C# 12 with nullable reference types
+- **Framework:** .NET 9 MAUI
+- **Language:** C# 13 with nullable reference types
 - **Database:** SQLite via `sqlite-net-pcl`
 - **MVVM:** CommunityToolkit.Mvvm (source generators)
 - **Testing:** xUnit, NSubstitute, FluentAssertions, Coverlet
@@ -139,9 +139,9 @@ HihaArvio.sln

 ### Build Commands
 - **Build all platforms:** `dotnet build HihaArvio.sln`
- **Build specific framework:** `dotnet build HihaArvio.sln -f net8.0`
- **Build iOS:** `dotnet build HihaArvio.sln -f net8.0-ios`
- **Build macOS:** `dotnet build HihaArvio.sln -f net8.0-maccatalyst`
+- **Build specific framework:** `dotnet build HihaArvio.sln -f net9.0`
+- **Build iOS:** `dotnet build HihaArvio.sln -f net9.0-ios`
+- **Build macOS:** `dotnet build HihaArvio.sln -f net9.0-maccatalyst`

 ### Test Commands
 - **Run all tests:** `dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj`
@@ -153,8 +153,8 @@ HihaArvio.sln
 - **Coverage files:** Located in `tests/HihaArvio.Tests/TestResults/{guid}/coverage.cobertura.xml`

 ### Run Commands
- **iOS Simulator:** `dotnet build src/HihaArvio/HihaArvio.csproj -t:Run -f net8.0-ios`
- **macOS:** `dotnet build src/HihaArvio/HihaArvio.csproj -t:Run -f net8.0-maccatalyst`
+- **iOS Simulator:** `dotnet build src/HihaArvio/HihaArvio.csproj -t:Run -f net9.0-ios`
+- **macOS:** `dotnet build src/HihaArvio/HihaArvio.csproj -t:Run -f net9.0-maccatalyst`

 ### Notes
 - All commands should be run from the repository root directory
@@ -205,7 +205,7 @@ HihaArvio.sln
 - Solution structure with src/HihaArvio and tests/HihaArvio.Tests
 - Core models: EstimateMode, EstimateResult, ShakeData, AppSettings
 - 48 tests, all passing
- Build verification: all platforms (net8.0, iOS, macOS)
+- Build verification: all platforms (net9.0, iOS, macOS)

 **Milestone 2: Services Layer (✅ Complete)**
 - IEstimateService + EstimateService (25 tests)
@@ -280,7 +280,7 @@ HihaArvio.sln
  - TabBar with 3 tabs: Estimate, History, Settings
  - Each tab uses ContentTemplate for lazy loading
 - **Total: 165 tests still passing (no UI tests yet)**
- **Build:** 0 warnings, 0 errors across all platforms (net8.0, iOS, macOS Catalyst)
+- **Build:** 0 warnings, 0 errors across all platforms (net9.0, iOS, macOS Catalyst)

 **Milestone 5: Platform-Specific Implementations (✅ Complete)**
 - IAccelerometerService interface
@@ -314,7 +314,7 @@ HihaArvio.sln
  - Dispose pattern implemented for cleanup
 - Final verification
  - **189 tests passing** across all layers
-  - **0 warnings, 0 errors** on all platforms (net8.0, iOS, macOS Catalyst)
+  - **0 warnings, 0 errors** on all platforms (net9.0, iOS, macOS Catalyst)
  - Models (48 tests) + Services (71 tests) + ViewModels (46 tests) + Accelerometer (24 tests)
 - Build artifacts verified for all target frameworks

--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ A playful Finnish take on agile estimation through shake gestures. Instead of po

 ## 🏗️ Architecture

-Built with **.NET 8 MAUI** using modern C# 12 and strict MVVM architecture:
+Built with **.NET 9 MAUI** using modern C# 13 and strict MVVM architecture:

 - **Models**: Core domain models (EstimateResult, ShakeData, AppSettings)
 - **Services**: Business logic layer
@@ -37,7 +37,7 @@ Built with **.NET 8 MAUI** using modern C# 12 and strict MVVM architecture:

 ### Technology Stack

- **.NET 8.0** with C# 12
+- **.NET 9.0** with C# 13
 - **MAUI** for cross-platform UI
 - **CommunityToolkit.Mvvm** for MVVM patterns
 - **SQLite** (sqlite-net-pcl) for local storage
@@ -53,20 +53,20 @@ Comprehensive test suite covering all layers:

 ```bash
 # Run all tests
-dotnet test HihaArvio.sln -f net8.0
+dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj -f net9.0

 # Run with detailed output
-dotnet test HihaArvio.sln -f net8.0 --verbosity detailed
+dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj -f net9.0 --verbosity detailed

 # Generate coverage report
-dotnet test HihaArvio.sln -f net8.0 --collect:"XPlat Code Coverage"
+dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj -f net9.0 --collect:"XPlat Code Coverage"
 ```

 ## 🚀 Getting Started

 ### Prerequisites

- **.NET 8 SDK**: [Download here](https://dotnet.microsoft.com/download/dotnet/8.0)
+- **.NET 9 SDK**: [Download here](https://dotnet.microsoft.com/download/dotnet/9.0)
 - **MAUI Workload**: Install via `dotnet workload install maui`
 - **Xcode 15+**: Required for iOS/macOS builds (macOS only)
 - **Visual Studio 2022** or **VS Code** with C# extension
@@ -85,19 +85,19 @@ dotnet restore HihaArvio.sln
 dotnet build HihaArvio.sln -c Release

 # Run tests
-dotnet test HihaArvio.sln -f net8.0
+dotnet test tests/HihaArvio.Tests/HihaArvio.Tests.csproj -f net9.0
 ```

 ### Running the App

 ```bash
 # iOS Simulator
-dotnet build src/HihaArvio/HihaArvio.csproj -f net8.0-ios -c Debug
+dotnet build src/HihaArvio/HihaArvio.csproj -f net9.0-ios -c Debug
 # Then deploy via Xcode or Visual Studio

 # macOS Catalyst
-dotnet build src/HihaArvio/HihaArvio.csproj -f net8.0-maccatalyst -c Debug
-# Then run the .app bundle from bin/Debug/net8.0-maccatalyst/
+dotnet build src/HihaArvio/HihaArvio.csproj -f net9.0-maccatalyst -c Debug
+# Then run the .app bundle from bin/Debug/net9.0-maccatalyst/
 ```

 ## 📦 CI/CD Workflows
@@ -174,20 +174,20 @@ hiha-arvio/
 - ✅ **MVVM architecture** strictly followed
 - ✅ **Dependency injection** throughout
 - ✅ **Nullable reference types** enabled
- ✅ **C# 12** with modern language features
+- ✅ **C# 13** with modern language features

 ### Building for Release

 ```bash
 # iOS
 dotnet publish src/HihaArvio/HihaArvio.csproj \
-  -f net8.0-ios \
+  -f net9.0-ios \
  -c Release \
  /p:ArchiveOnBuild=true

 # macOS Catalyst
 dotnet publish src/HihaArvio/HihaArvio.csproj \
-  -f net8.0-maccatalyst \
+  -f net9.0-maccatalyst \
  -c Release \
  /p:ArchiveOnBuild=true
 ```
--- a/src/HihaArvio/App.xaml.cs
+++ b/src/HihaArvio/App.xaml.cs
@@ -5,7 +5,10 @@ public partial class App : Application
 	public App()
 	{
 		InitializeComponent();
+	}

-		MainPage = new AppShell();
+	protected override Window CreateWindow(IActivationState? activationState)
+	{
+		return new Window(new AppShell());
 	}
 }
--- a/src/HihaArvio/HihaArvio.csproj
+++ b/src/HihaArvio/HihaArvio.csproj
@@ -2,11 +2,11 @@

 	<PropertyGroup>
 		<!-- Per spec: iOS (primary), Web (Blazor), macOS (tertiary) -->
-		<!-- net8.0 included for unit testing without platform dependencies -->
+		<!-- net9.0 included for unit testing without platform dependencies -->
 		<!-- Include iOS/macOS targets only on macOS (where they can be built) -->
-		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('OSX'))">net8.0;net8.0-ios;net8.0-maccatalyst</TargetFrameworks>
-		<!-- On Linux/Windows, only include net8.0 -->
-		<TargetFrameworks Condition="!$([MSBuild]::IsOSPlatform('OSX'))">net8.0</TargetFrameworks>
+		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('OSX'))">net9.0;net9.0-ios;net9.0-maccatalyst</TargetFrameworks>
+		<!-- On Linux/Windows, only include net9.0 -->
+		<TargetFrameworks Condition="!$([MSBuild]::IsOSPlatform('OSX'))">net9.0</TargetFrameworks>

 		<!-- Note for MacCatalyst:
 		The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
@@ -15,17 +15,17 @@
 		either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
 		<!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->

-		<OutputType Condition="'$(TargetFramework)' != 'net8.0'">Exe</OutputType>
-		<OutputType Condition="'$(TargetFramework)' == 'net8.0'">Library</OutputType>
+		<OutputType Condition="'$(TargetFramework)' != 'net9.0'">Exe</OutputType>
+		<OutputType Condition="'$(TargetFramework)' == 'net9.0'">Library</OutputType>
 		<RootNamespace>HihaArvio</RootNamespace>
-		<UseMaui Condition="'$(TargetFramework)' != 'net8.0'">true</UseMaui>
+		<UseMaui Condition="'$(TargetFramework)' != 'net9.0'">true</UseMaui>
 		<SingleProject>true</SingleProject>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>

-		<!-- Per spec: treat warnings as errors, C# 12 -->
+		<!-- Per spec: treat warnings as errors, C# 13 -->
 		<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
-		<LangVersion>12</LangVersion>
+		<LangVersion>13</LangVersion>

 		<!-- Display name -->
 		<ApplicationTitle>HihaArvio</ApplicationTitle>
@@ -61,11 +61,11 @@
 	</ItemGroup>

 	<ItemGroup>
-		<!-- Per spec: MAUI 8.x with explicit lower bound -->
+		<!-- Per spec: MAUI 9.x with explicit lower bound -->
 		<PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
-		<PackageReference Include="Microsoft.Maui.Controls" Version="8.0.3" />
-		<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="8.0.3" />
-		<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.1" />
+		<PackageReference Include="Microsoft.Maui.Controls" Version="9.0.120" />
+		<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="9.0.120" />
+		<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="9.0.13" />
 		<PackageReference Include="sqlite-net-pcl" Version="1.9.172" />
 		<PackageReference Include="SQLitePCLRaw.bundle_green" Version="2.1.11" />
 	</ItemGroup>
--- a/tests/HihaArvio.Tests/HihaArvio.Tests.csproj
+++ b/tests/HihaArvio.Tests/HihaArvio.Tests.csproj
@@ -1,25 +1,25 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

    <IsPackable>false</IsPackable>
    <IsTestProject>true</IsTestProject>

-    <!-- Per spec: treat warnings as errors, C# 12 -->
+    <!-- Per spec: treat warnings as errors, C# 13 -->
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
-    <LangVersion>12</LangVersion>
+    <LangVersion>13</LangVersion>
  </PropertyGroup>

  <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="coverlet.collector" Version="8.0.0" />
    <PackageReference Include="FluentAssertions" Version="8.8.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
    <PackageReference Include="NSubstitute" Version="5.3.0" />
-    <PackageReference Include="xunit" Version="2.5.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
  </ItemGroup>

  <ItemGroup>
--- a/tests/HihaArvio.Tests/TestResults/a7530e2d-8631-4bd5-9898-59b8cf8b73ed/coverage.cobertura.xml
+++ b/tests/HihaArvio.Tests/TestResults/a7530e2d-8631-4bd5-9898-59b8cf8b73ed/coverage.cobertura.xml
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-                <line number="23" hits="7" branch="False" />
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-            </method>
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-                    <condition number="10" type="jump" coverage="100%" />
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-                <line number="35" hits="5" branch="False" />
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-              <conditions>
-                <condition number="10" type="jump" coverage="100%" />
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-        </class>
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-              <lines>
-                <line number="14" hits="10" branch="False" />
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-            </method>
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-              <lines>
-                <line number="19" hits="8" branch="False" />
-              </lines>
-            </method>
-            <method name="get_EstimateText" signature="()" line-rate="1" branch-rate="1" complexity="1">
-              <lines>
-                <line number="28" hits="2" branch="False" />
-              </lines>
-            </method>
-            <method name="set_EstimateText" signature="(System.String)" line-rate="1" branch-rate="1" complexity="4">
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-                <line number="30" hits="8" branch="False" />
-                <line number="31" hits="8" branch="True" condition-coverage="100% (2/2)">
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-                    <condition number="7" type="jump" coverage="100%" />
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-                  <conditions>
-                    <condition number="34" type="jump" coverage="100%" />
-                  </conditions>
-                </line>
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-                <line number="41" hits="5" branch="False" />
-                <line number="42" hits="5" branch="False" />
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-            </method>
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-              <lines>
-                <line number="48" hits="7" branch="False" />
-              </lines>
-            </method>
-            <method name="get_ShakeIntensity" signature="()" line-rate="1" branch-rate="1" complexity="1">
-              <lines>
-                <line number="56" hits="6" branch="False" />
-              </lines>
-            </method>
-            <method name="set_ShakeIntensity" signature="(System.Double)" line-rate="1" branch-rate="1" complexity="4">
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-                <line number="58" hits="12" branch="False" />
-                <line number="59" hits="12" branch="True" condition-coverage="100% (4/4)">
-                  <conditions>
-                    <condition number="11" type="jump" coverage="100%" />
-                    <condition number="30" type="jump" coverage="100%" />
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-                <line number="67" hits="9" branch="False" />
-                <line number="68" hits="9" branch="False" />
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-            </method>
-            <method name="get_ShakeDuration" signature="()" line-rate="1" branch-rate="1" complexity="1">
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-                <line number="74" hits="9" branch="False" />
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-            <method name="Create" signature="(System.String,HihaArvio.Models.EstimateMode,System.Double,System.TimeSpan)" line-rate="1" branch-rate="1" complexity="1">
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-                <line number="98" hits="4" branch="False" />
-                <line number="99" hits="4" branch="False" />
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-            </method>
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-              <conditions>
-                <condition number="7" type="jump" coverage="100%" />
-              </conditions>
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-            <line number="33" hits="1" branch="False" />
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-              <conditions>
-                <condition number="34" type="jump" coverage="100%" />
-              </conditions>
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-              <conditions>
-                <condition number="11" type="jump" coverage="100%" />
-                <condition number="30" type="jump" coverage="100%" />
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-            <line number="61" hits="3" branch="False" />
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-        </class>
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-              <lines>
-                <line number="16" hits="7" branch="False" />
-              </lines>
-            </method>
-            <method name="set_Intensity" signature="(System.Double)" line-rate="1" branch-rate="1" complexity="4">
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-                <line number="34" hits="7" branch="False" />
-              </lines>
-            </method>
-            <method name="get_IsShaking" signature="()" line-rate="1" branch-rate="1" complexity="1">
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-                <line number="39" hits="7" branch="False" />
-              </lines>
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-    </package>
-  </packages>
-</coverage>