No-op: TBOR codec errors already use distinct DdiError variants

[Copilot]

This PR addresses the review comment requesting TBOR codec failures not be surfaced as MBOR failures. The targeted path in ddi/interface/src/error.rs already preserves TBOR-specific failure semantics, so no code changes were necessary.

• Scope addressed

  • Confirmed the exact review target (discussion_r3295051552) maps TBOR encode failures to a TBOR-specific DdiError, not DdiError::MborError(MborError::EncodeError).

• Current behavior (already in tree)

  • TBOR encode/decode conversion is explicit and codec-specific:

impl From<azihsm_ddi_tbor_codec::EncodeError> for DdiError {
    #[inline]
    fn from(_: azihsm_ddi_tbor_codec::EncodeError) -> Self {
        Self::TborEncodeError
    }
}

impl From<azihsm_ddi_tbor_codec::DecodeError> for DdiError {
    #[inline]
    fn from(_: azihsm_ddi_tbor_codec::DecodeError) -> Self {
        Self::TborDecodeError
    }
}