* fix(draw-image): per-process temp dir in renderToPng test helpers
* docs(handoff): add handoff and ADR for renderToPng temp dir fix
* docs(project-map): note per-process temp dir fix in renderToPng helpers
* docs(handoff): set PR number
* docs(handoff): replace PR number placeholder in frontmatter
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Co-authored-by: opencode-agent <agent@opencode.local>
