feat: Phase 6 — 242K tickets migrated as Issues with parent/child
- 38 Issue Types from ticket_dept
- 242,605 Issues created (open + closed)
- 25,805 parent/child links (incident pattern)
- Custom fields: parent_incident, is_incident, affected_clients, impact_zone, service_location, legacy_ticket_id
- Communications deferred (778K closed ticket messages — import separately)
- 0 staff→user mapped (ERPNext users need to be created/linked)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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