brand: document searchi identity and add reusable logo masters

README.md

@@ -1,4 +1,6 @@
-# Searchi
+# searchi
+
+**Find what matters. Locally.**
 
 Local desktop search for Windows, macOS and Linux. Under active development;
 production readiness is tracked in [the roadmap](docs/ROADMAP.md).
@@ -70,6 +72,7 @@ cargo run -p searchi-cli -- --help
 Desktop development instructions live in `apps/desktop/README.md`.
 Agent constraints and workflows live in [AGENTS.md](AGENTS.md) and
 [SKILLS.md](SKILLS.md). Use Node.js 24+ for frontend state tests.
+The approved visual identity and desktop direction live in [the brand guide](docs/BRAND.md).
 
 For a headless build, run `cargo build --release --locked -p searchi-cli`.
 No Node, Tauri, or WebView is needed. Semantic commands additionally need the