Added

• Guardian preset boost (guardian): built-in totem-style defensive boost with default effects (DAMAGE_RESISTANCE, HEALTH_BOOST) and preconfigured GUI slot.
• Per-boost revive options in boosts.yml:
  • revive-enabled (default false)
  • revive-hearts (default 4.0, clamped to safe bounds)
• Lethal-hit interception for revive-enabled boosts: when incoming damage would be fatal, death is prevented, configured health is restored, and the active boost is consumed immediately (single-use per activation).
• Guardian hover preview screenshot: /boost GUI hover state for Guardian added to release/listing visuals.

!Guardian Boost Hover