Use shared Renovate preset

[compscidr]

Part of a sweep moving all Kotlin/Java repos onto the shared compscidr/renovate-config presets, so the automerge policy and the JUnit/compileSdk reasoning live in one place instead of being copy-pasted per repo.

Uses :android, which adds compileSdk tracking against the latest released Android API level. Not :android-junit5 — that preset holds junit-bom below 6 for the de.mannodermaus.junit5 instrumented-test runner, which this repo does not use.

Any repo-specific settings already here were carried over unchanged.

The compileSdk manager exists because androidx releases periodically start requiring a newer compileSdk, which fails checkAarMetadata on every open Renovate PR at once with an error that reads like a minSdk problem. It is not — minSdk and targetSdk are deliberately left alone.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the repository’s Renovate configuration to use the shared compscidr/renovate-config:android preset, centralizing automerge policy and Android compileSdk tracking logic outside this repo.

Changes:

• Replace the local config:recommended + per-repo packageRules automerge configuration with github>compscidr/renovate-config:android.
• Remove now-redundant in-repo Renovate rules that are covered by the shared preset.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.27%. Comparing base (112fd72) to head (bac1903).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #314   +/-   ##
=========================================
  Coverage     79.27%   79.27%           
  Complexity       79       79           
=========================================
  Files            18       18           
  Lines           497      497           
  Branches         56       56           
=========================================
  Hits            394      394           
  Misses           68       68           
  Partials         35       35           

Flag	Coverage Δ
libunittests	79.27% <ø> (ø)

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