docs: guard PaperJSX install guidance
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paperjsx/SKILL.md to the currently installable PPTX package.workspace:* dependencies.Closes #42.
git diff --checkpaperjsx/SKILL.md frontmatter still includes name and description.npm view @paperjsx/json-to-pptx@latest version dependencies --json shows concrete dependency versions.npm view @paperjsx/json-to-docx@latest dependencies --json, @paperjsx/json-to-xlsx, @paperjsx/json-to-pdf, and @paperjsx/mcp-server still show workspace:* entries.npm install @paperjsx/json-to-docx@latest --package-lock-only --ignore-scripts failing with EUNSUPPORTEDPROTOCOL / unsupported workspace: URL.@paperjsx/json-to-pptx render; it generated a non-empty smoke.pptx.