Add Rage Winterchill Death and Decay avoidance in Hyjal Summit

[Copilot]

Winterchill’s Death and Decay was missing the encounter-specific handling that Azgalor’s Rain of Fire already has. This adds a single-active-zone tracker, a dedicated escape action, and movement suppression so bots step out cleanly and resume normal behavior when the 20s effect expires.

• Encounter state tracking

  • Track the active Death and Decay dynamic object by instance.
  • Expire the tracked zone after 20s, matching the spell duration.
  • Use Winterchill-specific radius constants for trigger, escape, and movement-control thresholds.

• Behavioral response

  • Add a Winterchill action that uses MoveAway(winterchill, 5.0f) instead of generic AoE avoidance.
  • Trigger that action only for non-tanks standing in the active Death and Decay zone.
  • Keep Winterchill’s existing no-target-swap behavior intact.

• Action arbitration

  • Add a Winterchill multiplier that suppresses competing movement and generic AoE avoidance while a bot is inside the tracked zone.
  • Release control automatically once the bot is clear or the zone expires.

• Strategy wiring

  • Register the new trigger, action, and multiplier in the Hyjal Summit action/trigger contexts and strategy.

if (!winterchill ||
    !IsBotInsideActiveWinterchillDeathAndDecay(bot, WINTERCHILL_DEATH_AND_DECAY_ACTION_RADIUS))
    return false;

return MoveAway(winterchill, 5.0f);