Re: [WICG/webcomponents] [open-stylable] Collection of user stories (Issue #1052)

From [shadow layers](https://github.com/WICG/webcomponents/issues/909#issuecomment-1993388146) proposal ([noting](https://github.com/WICG/webcomponents/issues/909#issuecomment-2005039901) they may be a bit over-broad particularly as to coordination scenarios):

## Use Cases Addressed

- **Include all document CSS as a low priority layer inside a shadow tree.** This is the heart of a solution to the original issue as opened.
- **Support both declarative and imperative use.** Declarative shadow trees are fully supported from the onset, as well as imperative use cases.
- **Include selected document CSS as a layer inside a shadow tree.** Selected named outer layers can be brought into a shadow tree by either a shadow tree designer or shadow tree user.
- **Enable layer reprioritization.** Inner and outer context layers can be intermixed and reprioritized.
- **Enable shadow tree designers to bring in document CSS without intervention by a shadow tree user.** If desired, a shadow tree designer can bring in all of or just selected layers of the document outer context CSS, without intervention of the shadow tree user.
- **Enable coordination between shadow tree designers and shadow tree users.** Either can bring in and repriortize outer layers.
- **Enable shadow tree user to add and repriortize layers originally provided by shadow tree designer.** A user can bring in any chosen outer layer, not just those pre-defined by a designer.
- **Enable a shadow tree designer to "advertise" to shadow tree users the CSS priorities of a shadow tree's inner context.** A designer can expose, publish, or document the original layer order of a shadow tree, so that a user can knowingly adjust it or add to it.
- **Polyfillable.** As hopefully implied by this proof of concept implementations.

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