fix: resolve linting issues in moderation.ts
- Fixed return-await issues by properly awaiting emitEvent calls
- Replaced template literal expressions with nullish coalescing for agent.did
- Removed unused parameter from checkAccountLabels function
- Made checkAccountLabels function non-async since it only returns null
- Applied nullish coalescing operator for better type safety
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Co-Authored-By: Claude <noreply@anthropic.com>