v0.20.5

Changed

• Rewrote the English and Russian READMEs to reflect the matured workspace, feature flags, telemetry flows and transport integrations introduced across the 0.20 releases.

Fixed

• Promoted the gRPC converter to an infallible From<Error> implementation
  while retaining the TryFrom API via the new documented
  StatusConversionError, satisfying Clippy's infallible conversion lint.
• Collapsed nested metadata guards in the Tonic adapter and reused borrowed
  booleans to silence Clippy without regressing runtime behaviour.
• Simplified the AppResult alias test to avoid large Err variant warnings
  from Clippy's result_large_err lint.