Adopt Ghostwire name and approved ghost mascot

assets/README.md

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+# Ghostwire brand assets
+
+Ghostwire's mascot is a minimal white ghost with a black outline, angry eyes and a mischievous smile. Use it with the project name **Ghostwire**. The optional tagline is **Inside the process. Across the wire.**
+
+- [ghostwire-icon.svg](ghostwire-icon.svg): editable vector master, white ghost on a transparent background.
+- [ghostwire-icon.png](ghostwire-icon.png): 512 × 512 PNG on white, suitable for repository avatars and previews.
+
+Prefer the SVG for resizing. Preserve the silhouette, facial expression and proportions. Use on a light background, with space around the icon. Avoid gradients, shadows or stretching. The icon is independent of WhatsApp's branding.
+
+These are visual identity assets, not runtime dependencies. See [licensing status](../LICENSE.md) for the repository's current terms.