Explain that setup-java's maven cache only stores what a run downloads and
is not re-saved on a hit, so plugin dependencies resolved lazily (e.g. by
maven-shade-plugin) can be missing from the cache. Document a dependency
resolution 'seed' step (dependency:go-offline + dependency:resolve-plugins)
in README and a fuller advanced-usage section with a goal-comparison table,
single-job and separate-seed-job examples, and caveats.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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