Add Slidev presentation on Agent Skills and Mapbox skills

.markdownlintignore

@@ -3,3 +3,4 @@ node_modules
 build
 **/build/**
 .git
+presentations/**

.prettierignore

@@ -3,6 +3,9 @@ package-lock.json
 .git
 CHANGELOG.md
 
+# Slidev presentations (use --- as slide separators, not Markdown HR)
+presentations/
+
 # Build artifacts
 **/build/
 **/.gradle/

presentations/mapbox-skills/.gitignore

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+node_modules/
+dist/
+*.pdf

presentations/mapbox-skills/README.md

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+# Mapbox Agent Skills — Presentation
+
+A [Slidev](https://sli.dev) presentation covering Agent Skills and the Mapbox skills library.
+
+## Running
+
+```bash
+cd presentations/mapbox-skills
+npm install
+npm run dev
+```
+
+Then open [http://localhost:3030](http://localhost:3030).
+
+## Building
+
+```bash
+npm run build   # outputs to dist/
+npm run export  # exports to PDF
+```
+
+## Slides
+
+1. Title — Mapbox Agent Skills
+2. What Are Agent Skills? (tools vs skills vs prompts)
+3. How Skills Work (install commands)
+4. Skill Structure (file layout + frontmatter)
+5. 18 Skills Across 6 Domains (overview)
+6. 18 Skills (cont.) — MCP, migration, security
+7. Deep Dive: Web Performance
+8. Deep Dive: iOS & Android
+9. Deep Dive: MCP Integration
+10. Skill Benchmarks (evals)
+11. Why Evals Matter (base model failures)
+12. Skills + MCP: Better Together
+13. Contributing a Skill
+14. Resources
+15. Q&A