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Adopts the rest of family idea #5103 (distributing your own APK): - Practice 2: build.gradle.kts no longer falls back to the debug key when ANDROID_KEYSTORE_PATH is unset; the release build is signed with the release key or left unsigned. Main no longer builds and uploads a debug-signed app-debug.apk, which no install could ever update. - Practice 3: android-release runs apksigner on the built APK, prints the signer's DN and SHA-256 digest, and fails on a debug signer. An unsigned build fails the same step, since there is no app-release.apk to verify. - Practice 9: debug builds offer no server update. The banner does not poll and the About card says updates come from Android Studio, since the release-signed APK cannot install over a debug-signed app. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>