Add ABI-specific GitHub APKs and user-friendly app copy

[SLemon418]

What changed

• Build and verify five GitHub distribution APKs: universal, arm64-v8a, armeabi-v7a, x86, and x86_64.
• Package each APK with a matching SHA-256 checksum and publish all ten assets from the release workflow.
• Enforce exact metadata, ABI topology, semantic-model payload, size limits, and signer certificate across every release APK.
• Keep non-release builds to one universal APK.
• Rewrite Korean and English settings, rules, simulator, insights, backup, model, and privacy copy around user outcomes.
• Localize raw boolean, semantic-intent, importance, and trace labels without changing persisted values.
• Synchronize the README, build guide, user guide, training notes, and repository rules.

Why

GitHub Releases cannot select the correct ABI automatically like Play delivery, so users need clear, smaller per-ABI choices plus a universal fallback. The existing app descriptions also exposed internal ML and rule-engine terminology that made settings and statistics harder to understand.

User and developer impact

Users can download one APK matching their device and its checksum, while choosing universal when unsure. App explanations now describe what a setting changes, what remains active when it is disabled, and which data stays on-device. Existing rule storage and semantic contracts remain compatible.

Validation

• ./gradlew --no-daemon --dependency-verification strict check
• ./gradlew --no-daemon --dependency-verification strict :app:testDebugUnitTest :app:lintDebug
• ./gradlew --no-daemon --dependency-verification strict :app:assembleDebug
• ./gradlew --no-daemon --dependency-verification strict :app:assembleRelease
• python3 -m unittest discover -s scripts/tests -p 'test_*.py' -v (31 tests)
• Signed five-APK signer, payload, size, and ABI verification passed with the configured release key.
• git diff --check

[SLemon418]

@codex review

[SLemon418]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 8d5ff02fed

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[SLemon418]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

Reviewed commit: c12b716cec

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".