Weave the native Android client through the profile README: fifth row in
the pieces table, a second client branch in the architecture diagram, a
"how it fits" note (API-only client, self-configuring URL, ntfy push, no
Play Services), a Quick start section, a where-to-go-next pointer, and a
CI badge.
Co-Authored-By: Claude <noreply@anthropic.com>
