brand: document searchi identity and add reusable logo masters

docs/BRAND.md

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+# searchi identity
+
+Approved direction, 2026-10-12: lowercase **searchi**. Positioning: a fast,
+private, cross-platform desktop search application. Tagline:
+**Find what matters. Locally.**
+
+| Token | Value | Use |
+| --- | --- | --- |
+| Brand blue | `#2563FF` | Mark, focus, primary action, selection accents |
+| Dark | `#0B0F14` | Dark base and dark wordmark |
+| Light | `#F8FAFC` | Light base and reversed wordmark |
+| Typography | Inter / Geist | Locally bundled UI font; system fallback |
+| Style | Flat, geometric, minimal | Restrained surfaces and clear hierarchy |
+
+The S-shaped search symbol is the recognizable identity. Reuse the master assets
+from assets/brand rather than approximating the mark with text or a search glyph.
+Use a symbol-only icon at small sizes; pair it with the lowercase wordmark when
+space permits. Keep clear space, preserve proportions, and avoid decorative
+gradients, shadows inside the mark, or stretching. OS icon masks and window
+materials may add platform-specific presentation around the flat identity.
+
+## Desktop direction
+
+The user selected the first search-and-preview concept and requested a mix with
+Raycast: compact, keyboard-first search with a grouped result list on the left
+and a readable passage preview on the right. Search is dominant; settings,
+filters, and model details use progressive disclosure. Use native window chrome,
+dialogs, theme behavior, and platform shortcut labels.
+
+Apply brief selection/preview transitions without delaying retrieval or input.
+Respect reduced motion and forced colors. Preserve focus, selection, and scroll
+when semantic results arrive. Preview only real extracted content and supported
+locations; do not fabricate document pages, confidence percentages, or metadata.
+
+## Distribution and copy
+
+Use the same master icon for Tauri app icons and repository avatar. The wordmark
+and symbol can also be reused on a future website; no website publication is
+authorized by adding these assets. CLI output remains readable plain text with
+the lowercase searchi name, without mandatory color or ASCII logo art.
+
+The brand board's example `searchi winter.pdf` is illustrative. Documentation
+must show the actual supported CLI syntax. Model downloads require networking;
+file extraction, inference, and search remain local. Never turn visual marketing
+copy into unsupported performance or production-readiness claims.