[Feature] Android Lint documentation and skill

> [!NOTE]
> Feature requests are accepted only if the proposed skill fills a verified gap in state-of-the-art LLMs. To assess this, please test your use case against both a fast model (e.g., Gemini 3 Flash) and a reasoning/thinking model (e.g., Gemini 3.1 Pro).

### What is the gap in the LLM's knowledge?

Creating idiomatic Lint rules with caching and fixes.

### Proposed Skill

The skill should allow creating/updating Lint rules with onboarded AI with the latest Android Lint capabilities.

### Additional Context

Android Lint has very thorough documentation and Android Lint itself is very powerful, but nether developers nor AIs have knowledge what features Lint has.

Start by testing the stated gap against a fast model and a reasoning model, as requested in the issue, and compare their results with the Android Lint documentation. The issue provides no files, tests, or entry points. Done means producing a skill that covers creating and updating Lint rules, including idiomatic rules, caching, fixes, and current Lint capabilities.

Written by the indexing model from the issue text.