* Standardized header ordering for C++ repo
* Reordered categories to move private headers above public headers; added space between categories to enable future flexibility
* Implement tracing for Attestation and Template services
* Pipeline no longer requires service name if opting into distributed tracing; enable tracing in attestation service
* Generate user-agent header from request activity policy
* Added test to catch the redacted header regression
* Updated documentation to reflect API surface changes
