release 0.4.28

What's Changed

• docs: fix "quuickstart" typo and duplicated heading in supported_providers.rst by @Lagmator22 in #987
• fix: GPT-5.6 SSE streams truncated through /v1/responses (chunk framing, raw identity passthrough, gzip window) by @Jiliac in #988
• feat(routing): automatic prompt caching + a per-session routing budget by @Spherrrical in #982
• release 0.4.28 by @Spherrrical in #994

New Contributors

• @Lagmator22 made their first contribution in #987
• @Jiliac made their first contribution in #988

Full Changelog: 0.4.27...0.4.28