Add tree-position scoping to Page.aggregateerdgeist-revive-events

New :children option ("direct" or "all") on the [aggregate] shortcode,
composable with the existing :tags filter - both apply as independent
successive .where clauses, ANDing together automatically, no special
casing needed. content_helper.rb passes the current @page.node through
as :node whenever :children is requested, since Page.aggregate has no
way to resolve "which node" from the shortcode's bare option strings on
its own. Guarded so nothing changes for any existing [aggregate]
shortcode that never uses children= - :node stays nil, the new branch
never fires.

"all" resolves via node.descendants.pluck(:id) rather than embedding the
descendants relation directly as a subquery. Not proven strictly
necessary - extensive debugging this session initially pointed at a
subquery/table-alias collision, but every actual failure traced instead
to accumulated test-node debris left in the dev DB by earlier
interrupted runs, confirmed by re-running against a cleaned database.
Kept anyway as a one-round-trip-cheaper, more defensive default
regardless.

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