rawequal() cannot compare secret values (comparisons are prohibited).
Restore the pre-scan approach using C_UnitAuras.GetAuraDataBySpellName
which is C-level and returns aura data with non-secret auraInstanceID.
This maps known raid debuff spellIds to auraInstanceIDs before
HandleDebuff processes the auras, enabling instant detection.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>