Decision: retain DB column, mark DEPRECATED. Existing rows still return
feat_task_id via API. New accept flow (BE-PR-007) does not write it.
Clients should migrate to generated_tasks / Task.source_proposal_id.
- Backend: model/schema/router deprecation comments updated
- Backend: added docs/BE-PR-010-feat-task-id-deprecation.md
- Tests: updated to work with Essential-based accept flow
- Tests: all 21 proposal tests pass
- TASKLIST: BE-PR-010 marked complete
zhi
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