Function is_excluded_feature 

fn is_excluded_feature(name: &str) -> bool

Returns true for feature names that must not appear in the CI matrix.

• default is always enabled by Cargo automatically.
• bench only changes module visibility for micro-benchmarks and does not need its own power-set of CI jobs.
• telemetry only aliases tracing + profiling, so adding it to the powerset would duplicate combinations that already compile the same code.