[Docs] Document InterceptorPhase and beforeGuardian damage interceptor phase

[Lyeeedar]

Summary

Updated docs/combat/triggers.md to document the new InterceptorPhase type and beforeGuardian phase that were added in commit d1f8e7f2.

Changes

docs/combat/triggers.md

• Replaced afterBarrier?: boolean documentation with the new phase?: InterceptorPhase field
• Added InterceptorPhase type definition: 'beforeGuardian' | 'preBarrier' | 'postBarrier'
• Added a pipeline table explaining when each phase runs and its intended use case
• Added a note that the old afterBarrier boolean field is no longer used and providing the migration mapping ('postBarrier' for afterBarrier: true, 'preBarrier' for afterBarrier: false)

Triggering Commit

• d1f8e7f20989f955bba49b5521fa02a18c58e693 - Add new interceptor phase, and make seal grace apply it
  • Added 'beforeGuardian' phase: runs at the very start of the damage pipeline, before guardian/puppet interception and every other mitigation. Used for full-negation effects like the challenge Grace Period.
  • Replaced afterBarrier: boolean on damageInterceptorEffects with phase?: InterceptorPhase

Review Rotation

Reviewed area: combat (rotating review)

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