Scaffold gui-cs/cli to Editor-style .NET 10 library layout with CI/release workflows

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{md,markdown}]
+trim_trailing_whitespace = false
+
+[*.{yml,yaml,json}]
+indent_size = 2
+
+[*.{csproj,props,targets,slnx,xml}]
+indent_size = 2
+
+[*.cs]
+csharp_indent_case_contents = true
+csharp_indent_labels = flush_left
+csharp_indent_switch_labels = true
+csharp_preserve_single_line_blocks = true
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_catch = true
+csharp_new_line_before_else = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_method_call_name_and_opening_parenthesis = true
+csharp_space_between_method_declaration_name_and_open_parenthesis = true
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_parentheses = false
+csharp_space_between_square_brackets = false
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = false:suggestion
+csharp_style_var_elsewhere = false:suggestion
+csharp_style_expression_bodied_methods = false:suggestion
+csharp_style_expression_bodied_constructors = false:suggestion
+csharp_style_expression_bodied_operators = false:suggestion
+csharp_style_expression_bodied_local_functions = false:suggestion
+csharp_style_expression_bodied_properties = when_on_single_line:suggestion
+csharp_style_expression_bodied_indexers = when_on_single_line:suggestion
+csharp_style_expression_bodied_accessors = when_on_single_line:suggestion
+csharp_style_expression_bodied_lambdas = true:suggestion
+dotnet_style_prefer_collection_expression = when_types_loosely_match:suggestion
+csharp_style_implicit_object_creation_when_type_is_apparent = true:suggestion
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_prefer_pattern_matching = true:suggestion
+csharp_style_prefer_not_pattern = true:suggestion
+csharp_style_prefer_switch_expression = true:suggestion
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:suggestion
+dotnet_style_prefer_conditional_expression_over_return = true:suggestion
+csharp_style_prefer_range_operator = true:suggestion
+csharp_style_prefer_index_operator = true:suggestion
+csharp_prefer_simple_using_statement = true:suggestion
+csharp_using_directive_placement = outside_namespace:suggestion
+dotnet_style_prefer_auto_properties = false:none
+csharp_prefer_braces = true:suggestion
+csharp_prefer_static_local_function = true:suggestion
+dotnet_style_readonly_field = true:suggestion
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+csharp_preferred_modifier_order = public, private, protected, internal, file, new, static, abstract, virtual, sealed, readonly, override, extern, unsafe, volatile, async, required:suggestion
+resharper_space_before_new_parentheses = true
+resharper_space_before_method_call_parentheses = true
+resharper_space_before_method_parentheses = true
+resharper_space_before_empty_method_call_parentheses = true
+resharper_space_before_empty_method_parentheses = true
+resharper_space_before_typeof_parentheses = true
+resharper_space_before_default_parentheses = true
+resharper_space_before_checked_parentheses = true
+resharper_space_before_sizeof_parentheses = true
+resharper_space_before_nameof_parentheses = true

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: [main, develop]
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '10.0.x'
+          dotnet-quality: 'preview'
+
+      - name: Restore
+        run: dotnet restore Terminal.Gui.Cli.slnx
+
+      - name: Build
+        run: dotnet build Terminal.Gui.Cli.slnx --no-restore -c Debug
+
+      - name: Verify code style
+        if: matrix.os == 'ubuntu-latest'
+        run: dotnet format Terminal.Gui.Cli.slnx --no-restore --verify-no-changes
+
+      - name: Terminal.Gui.Cli.Tests
+        run: dotnet run --project tests/Terminal.Gui.Cli.Tests --no-build -c Debug
+
+      - name: Terminal.Gui.Cli.IntegrationTests
+        run: dotnet run --project tests/Terminal.Gui.Cli.IntegrationTests --no-build -c Debug
+
+      - name: Terminal.Gui.Cli.SmokeTests
+        run: dotnet run --project tests/Terminal.Gui.Cli.SmokeTests --no-build -c Debug

.github/workflows/finalize-release.yml

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+name: Finalize Release
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [main]
+
+jobs:
+  finalize-release:
+    name: Tag, Release, and Back-merge
+    if: github.event.pull_request.merged == true && startsWith(github.event.pull_request.head.ref, 'release/')
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Checkout release merge commit
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ github.event.pull_request.merge_commit_sha }}
+          fetch-depth: 0
+          token: ${{ secrets.RELEASE_PAT }}
+
+      - name: Configure Git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+      - name: Extract release info from branch name
+        id: release
+        env:
+          RELEASE_BRANCH: ${{ github.event.pull_request.head.ref }}
+        shell: bash
+        run: |
+          BRANCH="$RELEASE_BRANCH"
+          TAG="${BRANCH#release/}"
+          SEMVER="${TAG#v}"
+
+          if echo "$SEMVER" | grep -q '-'; then
+            PRERELEASE="true"
+          else
+            PRERELEASE="false"
+          fi
+
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+          echo "semver=${SEMVER}" >> "$GITHUB_OUTPUT"
+          echo "prerelease=${PRERELEASE}" >> "$GITHUB_OUTPUT"
+
+      - name: Check if tag already exists
+        shell: bash
+        run: |
+          if git rev-parse "${{ steps.release.outputs.tag }}" >/dev/null 2>&1; then
+            echo "::error::Tag ${{ steps.release.outputs.tag }} already exists."
+            exit 1
+          fi
+
+      - name: Create annotated tag
+        shell: bash
+        run: |
+          TAG="${{ steps.release.outputs.tag }}"
+          git tag -a "$TAG" -m "Release $TAG"
+          git push origin "$TAG"
+
+      - name: Create GitHub Release
+        env:
+          GH_TOKEN: ${{ secrets.RELEASE_PAT }}
+          TAG: ${{ steps.release.outputs.tag }}
+          PRERELEASE: ${{ steps.release.outputs.prerelease }}
+        shell: bash
+        run: |
+          PRERELEASE_FLAG=""
+          if [ "$PRERELEASE" = "true" ]; then
+            PRERELEASE_FLAG="--prerelease"
+          fi
+
+          gh release create "$TAG" \
+            --title "$TAG" \
+            --generate-notes \
+            $PRERELEASE_FLAG
+
+      - name: Delete release branch
+        env:
+          RELEASE_BRANCH: ${{ github.event.pull_request.head.ref }}
+        shell: bash
+        run: |
+          BRANCH="$RELEASE_BRANCH"
+          git push origin --delete "$BRANCH" || true
+
+      - name: Create back-merge PR
+        env:
+          GH_TOKEN: ${{ secrets.RELEASE_PAT }}
+          TAG: ${{ steps.release.outputs.tag }}
+        shell: bash
+        run: |
+          BACKMERGE_BRANCH="backmerge/${TAG}"
+
+          git checkout -b "$BACKMERGE_BRANCH" "${{ github.event.pull_request.merge_commit_sha }}"
+          git push origin "$BACKMERGE_BRANCH"
+
+          gh pr create \
+            --base develop \
+            --head "$BACKMERGE_BRANCH" \
+            --title "Back-merge ${TAG} from main into develop" \
+            --body "Automatic back-merge after release ${TAG}. Merge this to keep \`develop\` in sync with \`main\`."