The previous logic only resolved support user codes to full names when
exactly one unique support code existed per ticket. Tickets with multiple
support codes (e.g. after reassignment) left all codes unresolved,
showing abbreviations like 'NKS' or 'FA' instead of full names.
Now: every support-role actor code in a ticket is mapped to that ticket's
Support_User_Name. For the debitor feed, codes are mapped on first
encounter to avoid conflicts from reassigned tickets.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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