[cheetahbyte]

Summary

Speeds up Android checks:

• gradle/actions/setup-gradle caches the Gradle distribution, dependencies, and build cache between runs. The cache is written from main and read on pull requests.
• ./gradlew test and ./gradlew lintDebug run as separate parallel jobs instead of one sequential step.
• lint { ignoreTestSources = true; checkDependencies = false } stops linting the app's unit-test and androidTest sources.

Why

The main run 42493339044 took about 6 minutes, over the two-minute limit for unit-test CI. Each run started with an empty Gradle home (about 1.5 minutes of configuration) and ran lint after tests, with app lint alone taking about 2 minutes.

Evidence

• Locally: ./gradlew test lintDebug succeeded.
• --dry-run before and after: :app:lintAnalyzeDebugUnitTest and :app:lintAnalyzeDebugAndroidTest are gone.
• CI timing: see this PR's run. The first PR run gets no cache benefit, because the cache is only written from main.

Known limits

• The configuration cache stays disabled: the sourceControl dependency on open-bot-avatar-kt is incompatible with it ("Configuration cache disabled because incompatible feature usage (source dependencies) was found").
• The avatar library is an included build, so it is still compiled and linted on every run (about 1 minute). Publishing or vendoring it would remove both costs.

Risk and rollback

Reversibility: Reversible

Blast radius: CI only. Lint no longer reports issues in test sources.