5.18.0
(feat): Add opt-in support for a structured User-Agent header of the form
{sdkName}/{version} ({os}; {arch}) Python/{pythonVersion}, matching the
Twilio helper-library shape. This is gated behind the include_platform_headers
config option and is disabled by default. When enabled, the platform + runtime
information is consolidated into the User-Agent header, superseding the
default {package}/{version} value, and the discrete X-Fern-Runtime /
X-Fern-Platform headers are no longer emitted. The platform group and runtime
segment are dropped gracefully when they cannot be determined, and the header
remains subject to omit_fern_headers.