Fix convert.mjs to resolve canvas from .export-runtime via createRequire
instead of bare import (which resolves relative to script location, not CWD).
Add File Location Convention section to SKILL.md — diagrams save .excalidraw
source alongside PNGs in the project's image directory for easy re-export.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>