Mobile testing

One skill for MetaMask Mobile functional testing. Classify the task, pick the layer, then open only the matching reference.

Out of scope: performance, visual, A/B, i18n, and flakiness skills — keep those separate.

First step — choose the layer

Read installed knowledge/testing-layers.md (source: ../../knowledge/testing-layers.md) before writing any test. references/layers.md is only a redirect stub.

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