Initial implementation of breadpaper

CLI tool that sets a wallpaper with awww, generates a pywal colour
palette, and reloads bread-theme to recolour all running bread GTK apps.
Includes CI workflows, bakery metadata, and Arch PKGBUILD.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: "-D warnings"
+
+jobs:
+  test:
+    name: fmt · clippy · test · build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Format check
+        run: cargo fmt --all -- --check
+
+      - name: Clippy
+        run: cargo clippy --all-targets -- -D warnings
+
+      - name: Test
+        run: cargo test --all --verbose
+
+      - name: Release build
+        run: cargo build --release --verbose

.github/workflows/release.yml

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+name: release
+
+on:
+  push:
+    tags: ["v*"]
+
+permissions:
+  contents: write
+
+env:
+  DL_DIR: /srv/breadway-dl
+  ECOSYSTEM_DIR: /home/breadway/Projects/bread-ecosystem
+
+jobs:
+  build:
+    runs-on: [self-hosted, hestia]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: build
+        run: cargo build --release --locked
+
+      - name: test
+        run: cargo test --release --locked
+
+      - name: prepare artifacts
+        run: |
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="${DL_DIR}/breadpaper/${VERSION}"
+          mkdir -p "${PKG_DIR}"
+          cp target/release/breadpaper "${PKG_DIR}/breadpaper-x86_64"
+          strip "${PKG_DIR}/breadpaper-x86_64"
+          sha256sum "${PKG_DIR}/breadpaper-x86_64" | awk '{print $1}' \
+            > "${PKG_DIR}/breadpaper-x86_64.sha256"
+          cp bakery.toml "${PKG_DIR}/bakery.toml"
+          ln -sfn "${VERSION}" "${DL_DIR}/breadpaper/latest"
+
+      - name: ensure bread-ecosystem
+        run: |
+          if [[ -d "${ECOSYSTEM_DIR}/.git" ]]; then
+            git -C "${ECOSYSTEM_DIR}" pull --ff-only
+          else
+            mkdir -p "$(dirname "${ECOSYSTEM_DIR}")"
+            git clone https://github.com/Breadway/bread-ecosystem.git "${ECOSYSTEM_DIR}"
+          fi
+
+      - name: regenerate index.json
+        run: bash "${ECOSYSTEM_DIR}/scripts/gen-index.sh"
+
+      - name: upload to GitHub Release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="${DL_DIR}/breadpaper/${VERSION}"
+          gh release create "${GITHUB_REF_NAME}" \
+            --title "breadpaper v${VERSION}" --generate-notes 2>/dev/null || true
+          gh release upload "${GITHUB_REF_NAME}" \
+            "${PKG_DIR}/breadpaper-x86_64" \
+            "${PKG_DIR}/breadpaper-x86_64.sha256" \
+            --clobber