Root cause: two issues caused CI failure:
1. publishSkill hit 429 rate limit from other tests in the suite
2. glob pattern '?' was ambiguous for matching literal '?' in URLs
Fix: remove publishSkill dependency, use regex route matching, and
return fully mocked API responses with fake skill data. This tests
the frontend pagination UI behavior without needing real published
skills.
The namespace detail page hardcoded a limit of 20 skills with no
pagination controls, so namespaces with more than 20 skills appeared
truncated. Add page state, wire it into the search query, and render
the shared Pagination component when total exceeds PAGE_SIZE. Also
reset page to 0 when the namespace param changes.
Closes#350
