[RFC-0007] Implement Battle domain

[copyleftdev]

TASK-006: Implement Battle domain

RFC: RFC-0007 - Domain Model
Component: Battle Domain
Estimate: s

Description

Create Battle, PerformanceSnapshot. Handle 3 battle events.

Acceptance Criteria

• AC-001: All 14 domains implemented
  • Verification: Each domain module exists
• AC-002: All 122 event types mapped
  • Verification: Cross-reference asyncapi.yaml

Dependencies

Depends on: TASK-003