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# A `<Ctx.Provider value>` seeds a value that descendant `useContext(Ctx)`
# consumers read during the same render. Dynamic scoping mirrors the client:
# the provider pushes the value before rendering its children and pops it
# after, and `use_context` reads the innermost active value (or the
# `createContext` default when none is active).
#
# The value stacks live in a package-level store rather than per-instance or
# on `$c->stash`: a parent template and the child templates it renders via
# `render_child` are separate bf instances that don't reliably share a
# controller (the Xslate backend runs with `c => undef`) nor a backend (the
# Mojo path lazily builds one per instance). SSR rendering is synchronous —
# nothing awaits between a provider's push and its matching pop — and the
# push/pop are perfectly balanced, so the per-name stack always unwinds to
# empty at the end of each provider subtree, keeping concurrent root renders
# isolated. provide/revoke return '' so they drop cleanly into an inline
# `<: … :>` (Kolon) or `% … ;` (EP) emit.

my %CONTEXT_STACKS;

sub provide_context ($self, $name, $value) {
    push @{ $CONTEXT_STACKS{$name} //= [] }, $value;