完善(08-09-deployment-contract-single-source-harness): 收敛部署合同并补失败路径

.trellis/tasks/08-09-deployment-contract-single-source-harness/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."}