diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 927cfff..9c1bf93 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,6 +6,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  ANDROID_NDK_VERSION: "27.0.12077973"
 
 jobs:
   check:
@@ -46,3 +47,28 @@ jobs:
         run: cargo run --locked -- --demo --json
       - name: Run fixture CLI
         run: cargo run --locked -- --mock tests/fixtures/me.json
+
+  android-lib-check:
+    name: Android library check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Linux GUI dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libfontconfig1-dev libxkbcommon-dev
+      - uses: android-actions/setup-android@v3
+      - name: Install Android SDK packages
+        run: |
+          sdkmanager \
+            "platforms;android-35" \
+            "ndk;${ANDROID_NDK_VERSION}"
+          echo "ANDROID_NDK_HOME=${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}" >> "$GITHUB_ENV"
+          echo "ANDROID_NDK_ROOT=${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}" >> "$GITHUB_ENV"
+          echo "CC_aarch64_linux_android=${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android35-clang" >> "$GITHUB_ENV"
+          echo "AR_aarch64_linux_android=${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar" >> "$GITHUB_ENV"
+          echo "CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER=${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android35-clang" >> "$GITHUB_ENV"
+      - name: Install Rust Android target
+        run: rustup target add aarch64-linux-android
+      - name: Check Android-gated library
+        run: cargo check --locked --features android-gui --target aarch64-linux-android --lib
diff --git a/README.md b/README.md
index 05419c1..acca391 100644
--- a/README.md
+++ b/README.md
@@ -378,6 +378,43 @@ See [ROADMAP.md](ROADMAP.md) for the current improvement backlog.
 - Linux (x86_64, aarch64)
 - Android/Termux — see [docs/termux.md](docs/termux.md); native Slint Android spike is tracked in [docs/android.md](docs/android.md)
 
+## Optional Jujutsu Workflow
+
+`jj` is reasonable here only as an optional local workflow on top of the
+existing Git repository. It can improve local iteration with operation log,
+conflict recovery, and cleaner in-progress history, but it should not replace
+the project's canonical GitHub flow.
+
+Recommended stance:
+
+- Use `jj` only if a developer or agent already prefers it locally.
+- Keep GitHub Issues, branches, PRs, and remote state managed through `git` +
+  `gh`.
+- Do not require `jj` in CI, build scripts, onboarding, or AGENTS workflow.
+- Do not add `vcs-jj` or `vcs-core` unless a future automation issue proves
+  they solve a concrete project problem.
+
+Minimal issue workflow with `jj`:
+
+```bash
+jj git clone https://github.com/xodapi/vimit.git
+cd vimit
+gh issue view 138
+git checkout -b issue-138-evaluate-optional-jujutsu-workflow
+jj bookmark create issue-138-evaluate-optional-jujutsu-workflow -r @
+
+# edit files, then verify the required check
+cargo fmt --check
+
+# when ready, sync the current jj commit to the Git branch and push normally
+jj git push --bookmark issue-138-evaluate-optional-jujutsu-workflow
+gh pr create --base main --title "docs(dev): evaluate optional Jujutsu workflow" --body "Closes #138"
+```
+
+If you use `jj`, treat it as a personal productivity layer. The repository
+still expects Git-compatible branch names, standard commits, and the same issue
+assignment / PR review flow documented in `AGENTS.md`.
+
 ## Tests
 
 ```bash
diff --git a/README.ru.md b/README.ru.md
index 3caa2ec..d345836 100644
--- a/README.ru.md
+++ b/README.ru.md
@@ -368,6 +368,43 @@ https://github.com/xodapi/vimit/discussions
 - Linux (x86_64, aarch64)
 - Android/Termux — см. [docs/termux.md](docs/termux.md); native Slint Android spike описан в [docs/android.md](docs/android.md)
 
+## Optional Jujutsu Workflow
+
+`jj` здесь уместен только как optional локальный workflow поверх уже
+существующего Git-репозитория. Он может сделать локальные итерации удобнее за
+счёт operation log, более мягкого восстановления после конфликтов и аккуратной
+истории промежуточных изменений, но не должен заменять canonical GitHub flow
+проекта.
+
+Рекомендация по проекту:
+
+- Использовать `jj` только если разработчику или агенту он уже удобен локально.
+- GitHub Issues, ветки, PR и remote state оставлять на `git` + `gh`.
+- Не делать `jj` обязательным для CI, build scripts, onboarding или AGENTS workflow.
+- Не добавлять `vcs-jj` или `vcs-core`, пока отдельный automation issue не
+  докажет, что это решает конкретную проблему проекта.
+
+Минимальный issue workflow с `jj`:
+
+```bash
+jj git clone https://github.com/xodapi/vimit.git
+cd vimit
+gh issue view 138
+git checkout -b issue-138-evaluate-optional-jujutsu-workflow
+jj bookmark create issue-138-evaluate-optional-jujutsu-workflow -r @
+
+# правки, затем обязательная проверка
+cargo fmt --check
+
+# когда всё готово, синхронизировать текущий jj commit с Git-веткой и пушить как обычно
+jj git push --bookmark issue-138-evaluate-optional-jujutsu-workflow
+gh pr create --base main --title "docs(dev): evaluate optional Jujutsu workflow" --body "Closes #138"
+```
+
+Если использовать `jj`, то только как личный слой удобства поверх Git. Для
+репозитория по-прежнему обязательны Git-совместимые имена веток, обычные
+коммиты и тот же issue/PR workflow, который описан в `AGENTS.md`.
+
 ## Тесты
 
 ```bash
diff --git a/docs/android.md b/docs/android.md
index 12ba687..389fff4 100644
--- a/docs/android.md
+++ b/docs/android.md
@@ -90,6 +90,19 @@ work.
 This is intentionally not a GitHub Release. Release tags and production
 release assets stay under the existing release workflow.
 
+## CI Android library check
+
+The main CI workflow installs the `aarch64-linux-android` Rust target and runs:
+
+```bash
+cargo check --locked --features android-gui --target aarch64-linux-android --lib
+```
+
+This is a fast compile guard for Android-gated Rust code. It does not install
+or run the APK, does not require API keys, and does not replace the manual APK
+artifact/device test above. Use the `Android Test APK` workflow when a change
+needs manifest, packaging, or real-device validation.
+
 ## Agent burn alerts
 
 The Android build declares `INTERNET`, `VIBRATE`, and `POST_NOTIFICATIONS`.