diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..781add5
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# Shell scripts run under bash on every CI runner, including Windows checkouts with autocrlf.
+*.sh text eol=lf
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ca37fec..dfbb05f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,20 +1,25 @@
+# Manual-only release build (PLAN §7.2): no push or pull_request trigger.
+# Each RID job runs build -> test -> publish/pack -> upload; a failing step
+# skips the rest of that job, so a RID whose tests fail produces no artifact.
+# No GitHub Release is created.
 name: Build
 
-# Manual trigger only. There is no push/pull_request trigger on purpose:
-# the project must not depend on push-triggered CI.
 on:
   workflow_dispatch:
 
-# Least privilege: the workflow only reads the repository and uploads artifacts.
 permissions:
   contents: read
 
+env:
+  DOTNET_NOLOGO: "true"
+  DOTNET_CLI_TELEMETRY_OPTOUT: "true"
+
 jobs:
   build:
     name: ${{ matrix.rid }}
     runs-on: ${{ matrix.os }}
     strategy:
-      # One failing RID must not cancel the others.
+      # Every RID stands on its own: one failure does not cancel the others.
       fail-fast: false
       matrix:
         include:
@@ -22,35 +27,43 @@ jobs:
             os: windows-latest
           - rid: linux-x64
             os: ubuntu-latest
+          - rid: osx-x64
+            os: macos-15-intel
           - rid: osx-arm64
-            os: macos-latest
-
+            os: macos-15
+    defaults:
+      run:
+        shell: bash
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup .NET
+      - name: Set up .NET
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 10.0.x
 
-      - name: Restore
-        run: dotnet restore YKanBan.slnx
-
       - name: Build
-        run: dotnet build YKanBan.slnx -c Release --no-restore
+        run: dotnet build YKanBan.slnx -c Release
 
-      # A failing test fails the job, so the publish and upload steps below are
-      # skipped and this RID produces no artifact.
       - name: Test
-        run: dotnet test YKanBan.slnx -c Release --no-build --no-restore
+        run: dotnet test YKanBan.slnx -c Release --no-build
 
       - name: Publish
-        run: dotnet publish YKanBan/YKanBan.csproj -c Release -r ${{ matrix.rid }} --self-contained true -o publish/${{ matrix.rid }}
+        run: >
+          dotnet publish YKanBan/YKanBan.csproj -c Release -r ${{ matrix.rid }}
+          --self-contained -o publish/${{ matrix.rid }}
+
+      - name: Pack
+        id: pack
+        run: |
+          version="$(dotnet msbuild YKanBan/YKanBan.csproj -getProperty:Version)"
+          bash packaging/package.sh ${{ matrix.rid }} publish/${{ matrix.rid }} dist "$version"
+          echo "name=YKanBan-$version-${{ matrix.rid }}" >> "$GITHUB_OUTPUT"
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
         with:
-          name: YKanBan-${{ matrix.rid }}
-          path: publish/${{ matrix.rid }}
+          name: ${{ steps.pack.outputs.name }}
+          path: dist/*
           if-no-files-found: error
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..51e014a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 yyc12345
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index 7ce16c5..ce9b71e 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,20 @@ A personal, local/offline kanban board. Cross-platform desktop app built with Av
 
 See [USAGE.md](USAGE.md) for workspaces, backups, the search syntax and command-line usage.
 
-## Build and test
+## Building
+
+Requires the .NET 10 SDK.
 
 ```
 dotnet build YKanBan.slnx
 dotnet test YKanBan.slnx
+dotnet run --project YKanBan -- <path>
 ```
 
 Packages are pinned in `YKanBan/YKanBan.csproj`.
+
+Release archives for win-x64, linux-x64, osx-x64 and osx-arm64 are produced by the manually triggered workflow in `.github/workflows/build.yml`; `packaging/package.sh` packs one published RID.
+
+## License
+
+MIT — see [LICENSE](LICENSE).
diff --git a/YKanBan/Assets/avalonia-logo.ico b/YKanBan/Assets/avalonia-logo.ico
deleted file mode 100644
index f7da8bb..0000000
Binary files a/YKanBan/Assets/avalonia-logo.ico and /dev/null differ
diff --git a/YKanBan/Assets/ykanban.ico b/YKanBan/Assets/ykanban.ico
new file mode 100644
index 0000000..24f7aa4
Binary files /dev/null and b/YKanBan/Assets/ykanban.ico differ
diff --git a/YKanBan/Views/MainWindow.axaml b/YKanBan/Views/MainWindow.axaml
index 36f5995..5b380ad 100644
--- a/YKanBan/Views/MainWindow.axaml
+++ b/YKanBan/Views/MainWindow.axaml
@@ -6,7 +6,7 @@
         mc:Ignorable="d" d:DesignWidth="1000" d:DesignHeight="640"
         x:Class="YKanBan.Views.MainWindow"
         x:DataType="vm:MainWindowViewModel"
-        Icon="/Assets/avalonia-logo.ico"
+        Icon="/Assets/ykanban.ico"
         Title="{Binding Title}"
         Width="1000" Height="640" MinWidth="720" MinHeight="480">
 
diff --git a/YKanBan/YKanBan.csproj b/YKanBan/YKanBan.csproj
index a8f9181..202d87e 100644
--- a/YKanBan/YKanBan.csproj
+++ b/YKanBan/YKanBan.csproj
@@ -7,6 +7,7 @@
     <Nullable>enable</Nullable>
     <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
     <ApplicationManifest>app.manifest</ApplicationManifest>
+    <ApplicationIcon>Assets\ykanban.ico</ApplicationIcon>
     <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
   </PropertyGroup>
 
diff --git a/packaging/macos/Info.plist b/packaging/macos/Info.plist
new file mode 100644
index 0000000..4a2962d
--- /dev/null
+++ b/packaging/macos/Info.plist
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleName</key>
+    <string>YKanBan</string>
+    <key>CFBundleDisplayName</key>
+    <string>YKanBan</string>
+    <key>CFBundleIdentifier</key>
+    <string>cn.blumia.code.yyc12345.ykanban</string>
+    <key>CFBundleIconFile</key>
+    <string>ykanban.icns</string>
+    <key>CFBundleExecutable</key>
+    <string>YKanBan</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleShortVersionString</key>
+    <string>@VERSION@</string>
+    <key>CFBundleVersion</key>
+    <string>@VERSION@</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>NSHighResolutionCapable</key>
+    <true/>
+</dict>
+</plist>
diff --git a/packaging/macos/ykanban.icns b/packaging/macos/ykanban.icns
new file mode 100644
index 0000000..6982ff9
Binary files /dev/null and b/packaging/macos/ykanban.icns differ
diff --git a/packaging/package.sh b/packaging/package.sh
new file mode 100755
index 0000000..5044319
--- /dev/null
+++ b/packaging/package.sh
@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+# Packs one published RID into a release archive.
+#
+#   packaging/package.sh <rid> <publish-dir> <output-dir> <version>
+#
+# win-x64   -> YKanBan-<version>-win-x64.zip     (folder YKanBan-<version>-win-x64/)
+# linux-x64 -> YKanBan-<version>-linux-x64.tar.gz (folder YKanBan-<version>-linux-x64/)
+# osx-*     -> YKanBan-<version>-<rid>.tar.gz     (YKanBan.app bundle, ad-hoc signed when possible)
+#
+# tar.gz keeps the executable bit, which a plain zip artifact upload would lose.
+set -euo pipefail
+
+if [ "$#" -ne 4 ]; then
+  echo "usage: $0 <rid> <publish-dir> <output-dir> <version>" >&2
+  exit 2
+fi
+
+rid="$1"
+publish_dir="$(cd "$2" && pwd)"
+mkdir -p "$3"
+output_dir="$(cd "$3" && pwd)"
+version="$4"
+script_dir="$(cd "$(dirname "$0")" && pwd)"
+name="YKanBan-${version}-${rid}"
+staging="$(mktemp -d)"
+trap 'rm -rf "$staging"' EXIT
+
+case "$rid" in
+  win-*)
+    cp -R "$publish_dir" "$staging/$name"
+    rm -f "$output_dir/$name.zip"
+    # 7-Zip ships on the Windows runners and writes '/' entry separators;
+    # Windows PowerShell 5.1's Compress-Archive writes '\', which breaks
+    # extraction outside Windows.
+    if ! command -v 7z > /dev/null 2>&1; then
+      echo "7z not found" >&2
+      exit 1
+    fi
+    (cd "$staging" && 7z a -tzip -bso0 -bsp0 "$output_dir/$name.zip" "$name")
+    ;;
+  linux-*)
+    cp -R "$publish_dir" "$staging/$name"
+    chmod +x "$staging/$name/YKanBan"
+    tar -C "$staging" -czf "$output_dir/$name.tar.gz" "$name"
+    ;;
+  osx-*)
+    app="$staging/YKanBan.app"
+    mkdir -p "$app/Contents/MacOS" "$app/Contents/Resources"
+    cp -R "$publish_dir/." "$app/Contents/MacOS/"
+    cp "$script_dir/macos/ykanban.icns" "$app/Contents/Resources/"
+    chmod +x "$app/Contents/MacOS/YKanBan"
+    sed "s/@VERSION@/${version}/g" "$script_dir/macos/Info.plist" > "$app/Contents/Info.plist"
+    if command -v codesign > /dev/null 2>&1; then
+      # Ad-hoc signature for the bundle. Not fatal: the SDK already ad-hoc
+      # signs the apphost, which is all arm64 needs to run, and --deep may
+      # trip over the non-Mach-O files in Contents/MacOS.
+      if ! codesign --force --deep --sign - "$app"; then
+        echo "warning: ad-hoc signing of YKanBan.app failed; packing it unsigned" >&2
+      fi
+    fi
+    tar -C "$staging" -czf "$output_dir/$name.tar.gz" YKanBan.app
+    ;;
+  *)
+    echo "unsupported RID: $rid" >&2
+    exit 2
+    ;;
+esac
+
+echo "packed $rid -> $output_dir"