fix: reject null Anthropic tool inputs
fix: secure Gemini auth and modernize OTel telemetry
fix: update openai baseurl parse
feat: classify content moderation rejections as
fix: handle late tool-call name in compat streams
feat: add OpenAI responses API mode
perf: handle malformed stream tool args
chore: update otel mod
fix: stream usage stamping, thinking effort/level
feat: support provider-level client headers