Tick finding: the locked art-direction README still pointed supporting references at this Mac\s Downloads folder. That made canonical project context depend on a local scratch path that would disappear for other agents and machines. Fix: commit the supporting art-direction mockups and prompts into assets/reference/art-direction/supporting, update references to repo-relative paths, and add the self-containment rule to spec/meta.md. Defense: spec/meta.md defines the spec layer as the agent-targetable contract surface. A spec or art-direction target that depends on local scratch files is not targetable. Required references belong in the repo; local paths are provenance only.