release 0.4.29

What's Changed

• feat(routing): read DO catalog cached-input rates for the routing budget by @adilhafeez in #995
• feat(routing): decouple budget pricing from prompt_caching by @adilhafeez in #996
• release 0.4.29 by @adilhafeez in #998

Full Changelog: 0.4.28...0.4.29