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+# MegaProxy project memory
+
+This file records stable project decisions and collaboration conventions for future coding sessions.
+Keep it concise and update it when a decision changes; do not add transient CI run IDs, temporary
+branch names, credentials, signing material, or other secrets.
+
+## Build and tooling
+
+- JDK 21 is the project toolchain. CI and F-Droid builds must use JDK 21. Local configuration must
+  discover a compatible JDK without hard-coding a Homebrew, macOS architecture, or user-specific
+  installation path.
+- Fastlane is the primary supported entry point for builds, checks, tests, and release artifacts.
+  Run it through Bundler (`bundle exec fastlane ...`) so `Gemfile.lock` controls dependency versions.
+  Keep the English and Russian command reference in `docs/en/fastlane.md` and
+  `docs/ru/fastlane.md` synchronized with the lanes in `fastlane/Fastfile`.
+- Direct scripts and Gradle tasks may remain implementation details behind Fastlane lanes, but
+  documentation and CI should normally expose the Fastlane commands.
+
+## CI and artifacts
+
+- Pull requests must run native tests, Android unit/lint/build checks, and instrumented Compose UI
+  tests.
+- PR builds may publish debug and unsigned APK artifacts. They must never have access to release
+  signing material and must never produce or publish a signed release APK.
+- Surface downloadable APK artifacts in the GitHub Actions job summary in addition to uploading
+  them through `actions/upload-artifact`.
+- UI tests use the lightweight API 30 `aosp_atd` x86_64 image. KVM acceleration is required: fail
+  quickly with a clear diagnostic when `/dev/kvm` is unavailable instead of falling back to the
+  unstable software emulator. An infrastructure retry should use a fresh job/runner rather than
+  repeatedly invoking instrumentation in the same crashed emulator.
+- Treat `Starting 0 tests`, missing XML reports, or fewer than the expected tests as a CI failure;
+  a green Gradle process alone is not proof that instrumentation tests ran.
+
+## Releases and distribution
+
+- Release builds and signing are separate from PR CI. Release artifacts are created only through
+  the dedicated release workflow/Fastlane lane.
+- After creating and verifying a release, update the corresponding F-Droid submission/build recipe
+  when required. The repository's F-Droid-related files are for reproducible verification, not an
+  excuse to maintain a duplicate unused build path.
+- Store F-Droid listing metadata and current store artwork under `fastlane/metadata/android`.
+  Obsolete artwork does not need an archive copy in the working tree because Git preserves history.
+
+## Product and UI conventions
+
+- All user-visible UI text must use Android string resources and be supplied in both the default
+  English resources and Russian resources. Do not localize standardized data-unit symbols.
+- Traffic totals and rates share the selected unit system. IEC is the default and uses powers of
+  1024 with Latin symbols (`KiB`, `MiB`, `GiB`, `TiB`, `PiB`); users can select SI powers of 1000
+  with Latin symbols (`KB`, `MB`, `GB`, `TB`, `PB`).
+- Traffic-limit inputs remain in `MiB` and must be labelled exactly with the Latin `MiB` symbol.
+- In Russian UI, translate “samples” as “сэмплы”, not “попытки”. Relative latency timestamps belong
+  on a separate line in smaller text.
+- Connection diagnostics include exit IP and country, with fallback providers so one unavailable
+  external service does not make the whole check fail. UI tests should assert that country is
+  actually presented, not merely fetched internally.
+
+## Architecture landmarks
+
+- `ProxyVpnService` extends Android's standard `android.net.VpnService`. It owns VPN lifecycle,
+  creates the TUN interface, coordinates profiles/reconnects/status, and hands the TUN file
+  descriptor to the native networking layer. Native code performs the actual proxy forwarding.
+- Navigation uses a single activity/back stack. Navigation, localization, settings persistence,
+  and cross-screen behavior should be covered by Compose instrumentation tests.
+
+## Collaboration workflow
+
+- Put each new change on a branch based on the current `main` and normally deliver it as one focused
+  GitHub pull request. After a PR is merged, start subsequent work from the updated `main` instead of
+  continuing on the merged branch.
+- Before changing CI after a failure, inspect the full job log and distinguish application test
+  failures from runner/emulator infrastructure failures.