Release v1.27.0

Features:

• azure: support Chat Completions logprobs (#1073) by Arton Ragsdale

• allow Gemini 3 object output with tools (#1077) by mvanhorn

• openai: support Decisions evaluations (#1075) by mikehostetler

Bug Fixes:

• schema: bound validator cache memory (#1078) by mikehostetler

• redact unknown provider reasoning payloads (#1070) by Wu Shuwen

• close shared contract gaps from design review (#1069) by mikehostetler

• openai: enforce anonymous auth and exact streaming model identity (#1065) by Justin Smestad

• openai: decode Responses refusals as text with content_filter finish reason (#1064) by Nickjgniklu

• http: prevent non-streaming connection pool timeouts (#1067) by mikehostetler