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# Register one manifest-driven child renderer: `$slot_key` becomes the
# `render_child` name, `$marked` locates the template, and `$signal_init`
# / `$manifest_defaults` seed the child's template vars (see
# `register_components_from_manifest` for the contract).
sub _register_manifest_child ($self, $slot_key, $marked, $signal_init, $manifest_defaults) {
    $marked //= '';
    return unless $marked;
    my $parent_scope = $self->_scope_id;
    # Weaken the parent capture so the child-renderer closures stored on
    # `$self->_child_renderers` don't keep `$self` alive (the direct
    # closure <-> parent cycle). The controller is reached through `$parent`
    # at call time rather than captured strongly here, so the closures hold
    # no strong reference to `$c` either — see the controller-cycle note in
    # `new`. `$parent` is always live whenever a closure runs (the closure is
    # stored on `$parent`, so `$parent` outlives every invocation).
    weaken(my $parent = $self);

    # `templates/ui/button/index.html.ep` → `ui/button/index`
    my $template_name = $marked;
    $template_name =~ s{^templates/}{};