Add macOS release workflow and README download

.github/workflows/release.yml

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+name: Release macOS app
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  build-sign-notarize:
+    runs-on: self-hosted
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install build deps
+        run: |
+          brew update
+          brew install zig
+
+      - name: Build GhosttyKit.xcframework
+        run: |
+          cd ghostty
+          zig build -Demit-xcframework=true -Dxcframework-target=native -Doptimize=ReleaseFast
+          cd ..
+          rm -rf GhosttyKit.xcframework
+          cp -R ghostty/macos/GhosttyKit.xcframework GhosttyKit.xcframework
+
+      - name: Build app (Release)
+        run: |
+          xcodebuild -scheme GhosttyTabs -configuration Release -derivedDataPath build CODE_SIGNING_ALLOWED=NO build
+
+      - name: Import signing cert
+        env:
+          APPLE_CERTIFICATE_BASE64: ${{ secrets.APPLE_CERTIFICATE_BASE64 }}
+          APPLE_CERTIFICATE_PASSWORD: ${{ secrets.APPLE_CERTIFICATE_PASSWORD }}
+        run: |
+          if [ -z "$APPLE_CERTIFICATE_BASE64" ]; then
+            echo "Missing APPLE_CERTIFICATE_BASE64 secret" >&2
+            exit 1
+          fi
+          if [ -z "$APPLE_CERTIFICATE_PASSWORD" ]; then
+            echo "Missing APPLE_CERTIFICATE_PASSWORD secret" >&2
+            exit 1
+          fi
+          KEYCHAIN_PASSWORD="$(uuidgen)"
+          echo "$APPLE_CERTIFICATE_BASE64" | base64 --decode > /tmp/cert.p12
+          security create-keychain -p "$KEYCHAIN_PASSWORD" build.keychain
+          security set-keychain-settings -lut 21600 build.keychain
+          security unlock-keychain -p "$KEYCHAIN_PASSWORD" build.keychain
+          security import /tmp/cert.p12 -k build.keychain -P "$APPLE_CERTIFICATE_PASSWORD" -T /usr/bin/codesign -T /usr/bin/security
+          security set-key-partition-list -S apple-tool:,apple: -s -k "$KEYCHAIN_PASSWORD" build.keychain
+          security list-keychains -d user -s build.keychain
+
+      - name: Codesign app
+        env:
+          APPLE_SIGNING_IDENTITY: ${{ secrets.APPLE_SIGNING_IDENTITY }}
+        run: |
+          if [ -z "$APPLE_SIGNING_IDENTITY" ]; then
+            echo "Missing APPLE_SIGNING_IDENTITY secret" >&2
+            exit 1
+          fi
+          APP_PATH="build/Build/Products/Release/GhosttyTabs.app"
+          /usr/bin/codesign --force --options runtime --timestamp --sign "$APPLE_SIGNING_IDENTITY" --deep "$APP_PATH"
+          /usr/bin/codesign --verify --deep --strict --verbose=2 "$APP_PATH"
+
+      - name: Notarize app
+        env:
+          APPLE_ID: ${{ secrets.APPLE_ID }}
+          APPLE_APP_SPECIFIC_PASSWORD: ${{ secrets.APPLE_APP_SPECIFIC_PASSWORD }}
+          APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
+        run: |
+          if [ -z "$APPLE_ID" ] || [ -z "$APPLE_APP_SPECIFIC_PASSWORD" ] || [ -z "$APPLE_TEAM_ID" ]; then
+            echo "Missing notarization secrets (APPLE_ID, APPLE_APP_SPECIFIC_PASSWORD, APPLE_TEAM_ID)" >&2
+            exit 1
+          fi
+          APP_PATH="build/Build/Products/Release/GhosttyTabs.app"
+          ZIP_PATH="GhosttyTabs-macos.zip"
+          ditto -c -k --sequesterRsrc --keepParent "$APP_PATH" "$ZIP_PATH"
+          xcrun notarytool submit "$ZIP_PATH" --apple-id "$APPLE_ID" --team-id "$APPLE_TEAM_ID" --password "$APPLE_APP_SPECIFIC_PASSWORD" --wait
+          xcrun stapler staple "$APP_PATH"
+
+      - name: Upload release asset
+        uses: softprops/action-gh-release@v2
+        with:
+          files: GhosttyTabs-macos.zip
+          generate_release_notes: true

README.md

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+# GhosttyTabs
+
+Vertical tabs for Ghostty on macOS, built on libghostty.
+
+[![Download macOS](https://img.shields.io/badge/Download-macOS-1b5fdd?style=for-the-badge&logo=apple)](releases/latest/download/GhosttyTabs-macos.zip)
+
+## Releases
+
+Tag a version like `v0.1.0` and push it to trigger the GitHub Actions release workflow.
+The workflow builds `GhosttyKit.xcframework`, builds the Release app, signs, notarizes,
+staples, and uploads `GhosttyTabs-macos.zip` to the release.
+
+### Required GitHub secrets
+
+- `APPLE_CERTIFICATE_BASE64`: Base64-encoded Developer ID Application .p12
+- `APPLE_CERTIFICATE_PASSWORD`: Password for the .p12
+- `APPLE_SIGNING_IDENTITY`: e.g. `Developer ID Application: Your Name (TEAMID)`
+- `APPLE_ID`: Apple ID used for notarization
+- `APPLE_APP_SPECIFIC_PASSWORD`: App-specific password for the Apple ID
+- `APPLE_TEAM_ID`: Apple Developer Team ID