make app ready to release

docs/release.md

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+# Post HUB Release Checklist
+
+Use this checklist before publishing a new build.
+
+## Version
+
+Update the release numbers in `app/build.gradle.kts`:
+
+```kotlin
+versionCode = 1
+versionName = "1.0.0"
+```
+
+Increase `versionCode` for every Play Store upload.
+
+## Signing
+
+Create an upload keystore and keep it outside git. The build reads signing values from environment variables or a local `keystore.properties` file in the project root.
+
+```properties
+POSTHUB_STORE_FILE=C:\\path\\to\\posthub-upload.jks
+POSTHUB_STORE_PASSWORD=your-store-password
+POSTHUB_KEY_ALIAS=posthub
+POSTHUB_KEY_PASSWORD=your-key-password
+```
+
+`keystore.properties`, `*.jks`, and `*.keystore` are ignored by git.
+
+## Build
+
+Run these commands from the project root:
+
+```powershell
+$env:GRADLE_USER_HOME='C:\Path\To\PostHUB\.gradle'
+.\gradlew.bat :app:testDebugUnitTest :app:lintRelease :app:bundleRelease --console=plain
+```
+
+Upload the generated bundle:
+
+```text
+app/build/outputs/bundle/release/app-release.aab
+```
+
+## Manual QA
+
+Before upload, install a fresh build and verify:
+
+- Single request Send works for GET and POST.
+- Flow can capture a value, save it, and reuse it in another request.
+- MCI, TCI, and IP client presets still populate requests correctly.
+- Home-screen widget refresh runs the saved flow and shows the latest response.
+- App launch shows the Post HUB splash and launcher icon on the emulator.
+
+## Store Notes
+
+Because Post HUB stores tokens and environment variables locally, Android backup is disabled in the manifest. Keep privacy copy clear that request data and saved variables stay on the device unless users send them through their own requests.