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+This directory stores request-scoped analysis artifacts produced during the TocoAI workflow.
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+Files under this directory are temporary working materials for a specific requirement or task. They are used to preserve reviewed business understanding, system analysis results, planning context, implementation summaries, and possible business knowledge update suggestions.
+
+This directory is not the long-term business knowledge base. Stable business facts should be promoted to `.toco/business/` only after the requirement has been reviewed, implemented, and verified.