v0.1.1

• Prompts no longer require the pi-prompt-template-model extension — each prompt now explicitly loads the skill itself
• Added "Writing Valid Mermaid" section to libraries.md (quoting special chars, simple IDs, max node count, arrow styles, pipe escaping)
• Fixed mobile scroll offset in responsive-nav.md — section headings now clear the sticky nav bar via scroll-margin-top
• Added video preview to README