Add a created_by field to track who created each issue, similar to how
comments have an author field.
- Add CreatedBy string field to Issue struct
- Add migration 029 to add created_by column to issues table
- Update all SELECT/INSERT/Scan statements across storage layer
- Populate created_by in bd create from actor chain
- Display created_by in bd show output
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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