v0.2.2

First release built and published entirely by CI (.github/workflows/build.yml), triggered by this tag. Verified
end to end: uninstalled the app, installed this exact APK, pushed the models, and generated an image on it.

Changes since v0.2

• Consistent debug signing. All builds — local and CI — now sign with a debug key checked into the repo
  instead of each machine's own ~/.android/debug.keystore. Without this, the CI-built APK couldn't update a
  locally-built install (INSTALL_FAILED_UPDATE_INCOMPATIBLE) and vice versa.
• push_models.sh: adb push into Android/data/<pkg> failed outright on a locked-down test device
  ("remote fchown failed", no file left behind); pushes now go through adb shell cat > instead, and the
  script chmods the directories/files so the app can actually read what's pushed. Also follows symlinks, so a
  text_encoder/ shared with another model isn't silently skipped.
• README trimmed and given a top-of-file link to the Chinese section.
• CI: builds the demo APK and qwenimage21 AAR on every push and PR; a v* tag build also attaches both here,
  named <artifact>-<tag>-<commit>.{apk,aar}.

Full Changelog: v0.2.1...v0.2.2