Flow / Skill / Kit / Tool boundary

This subject has provenance in frozen ADR history (0007-flow-skill-kit-tool-boundary.md, 0007-skill-audit.md) but no living decision has been ratified yet under the topic-keyed decision registry (context/contracts/decision-registry-contract.md). This stub records that the subject is open and links the frozen ADR(s) as provenance; it is not a decision.

When a living decision is ratified for flow / skill / kit / tool boundary, update this file’s status to current, add rationale, and keep the adr evidence links as provenance for the history that led here.