Switch from Bedrock to Anthropic endpoint as default. Include support for gpt-5.5 (#118)

fix: route bedrock/ model ids via LiteLLM Bedrock adapter (#89)

fix /model switcher with effort params

Make X-HF-Bill-To configurable via HF_BILL_TO env (default smolagents) (#57)

Route HF inference through /v1 auto-router + add reasoning_effort knob