实现 B-2a 报销审批内容工作台（reimbursement-approval-content-workbench）

.trellis/tasks/09-01-reimbursement-form-shared-component-migration/implement.jsonl

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+{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}