ALL-1878: Implement audit scanner service (duplicates, orphans, geocoding)
completedImplement auditScanner.ts in domains/identity/src/services/audit/ with scanWorkspace() orchestrator and 3 checks: DUPLICATE_CONTACTS, ORPHAN_DEVICES, MISSING_GEOCODES. Uses existing supergraph-client queries from ALL-1877. Findings returned as AuditFinding[] for consumption by ALL-1879 BullMQ job.
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CI green (lint pass, test pass, build pass) on PR #12739. Ready for review.
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