Set doc owner from chat assignment and update record

You get assignment notes in the docs ticket channel but working doc records stay unassigned and approvals stall. This updates document ownership so coordinators see owners and can act same day.

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Overview

Assignment notes that live only in chat leave working documents unowned and slow down launches; this flow captures those notes and writes ownership to the document record so coordinators always see who is responsible. That reduces handoff delays and gets owners acting the same day, especially for time-sensitive tidal project milestones.