Add Slidev pitch presentation

slides/README.md

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+# Stealth Pitch Slides
+
+Slidev presentation for the Stealth hackathon pitch.
+
+## Run
+
+```bash
+pnpm install
+pnpm run dev
+```
+
+Opens at http://localhost:3030/
+
+## Export
+
+```bash
+pnpm run build   # Static SPA to dist/
+pnpm run export  # PDF export
+```