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facet-core: Shape: Debug: format type_params as structured group

This commit changes the formatting of `type_params` in the `Debug`
implementation of `Shape` from angle brackets (`<T: u8>`) to guillemet-wrapped
parentheses (`«(T: u8)»`).

While angle brackets resemble Rust generic syntax, their use here was
misleading: `<T: u8>` is not valid Rust, and implies a syntactic structure
rather than a semantic representation of resolved parameter bindings.
This caused confusion when displayed alongside actual Rust type syntax,
such as `[u8; 3]` for arrays.

Parentheses better reflect the role of `type_params` as a fixed, structured
group of bindings, and maintain visual consistency with how other structured
fields (like `fields`) are displayed within `Type`. Wrapping the result in
guillemets preserves the distinction between custom summaries and Rust syntax.

The empty case remains formatted as `[]`, matching expectations for a
zero-length list and preserving visual contrast when no parameters are present.

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