Middleware names to strip from every stack this profile applies to.
Strings match AgentMiddleware.name exactly. Entries are grammar-checked
at construction: empty/whitespace strings, colon-containing strings, and
underscore-prefixed names all raise ValueError immediately.
Class-path (module:Class) entries are not currently supported and may
be added in a future revision. Until then, expose a stable public alias
via serialized_name on the middleware class and exclude by that alias.
This is the canonical on-disk representation used by to_dict /
from_dict.
