feat: add prelaunch site controls and refresh branding

DESIGN.md

@@ -134,6 +134,43 @@ military cosplay.
 - Explicit textual states paired with icons, color, and motion.
 - Responsive density from mobile touch layouts through scaled 4K workspaces.
 
+## Brand Identity
+
+SHD.build uses the two-color Core Segments identity. The emblem connects the
+orange Division signal with ISAC's role as the site's analytic system:
+
+- Three unequal Signal Orange arc segments form the outer circle. Each segment
+  has square ends.
+- The widest break sits in the upper-right quadrant and contains one detached
+  Signal Orange square, which represents a data packet.
+- A Field Manual White open square forms the ISAC core at the center.
+
+Keep the emblem in Signal Orange and Field Manual White on Operations Black,
+Terminal Black, or another approved dark surface. SHD.build has no one-color
+emblem. Do not close the arc gaps, equalize the segments, remove the data
+packet, fill the ISAC core, add letters to the emblem, or recolor either part.
+If a placement cannot reproduce both colors, use a dark holding surface or omit
+the emblem.
+
+The standard lockup pairs the emblem with the heavy angular `SHD.build`
+wordmark. Set `SHD` in Field Manual White and `.build` in Signal Orange. Place
+the uppercase descriptor `RESURGENCE DATA & TOOLS` below the wordmark in
+restrained telemetry type. Do not substitute another descriptor.
+
+Use the complete lockup in the 76px global header and shared footer. The header
+uses a 38px emblem; keep the wordmark and descriptor compact enough to preserve
+the navigation grid. Mobile headers may use the emblem alone when the complete
+lockup would crowd navigation. Favicons and app icons use the emblem without
+text. Small-size artwork must retain both colors, widen the arc gaps where the
+pixel grid requires it, and keep the packet and open core distinct.
+
+Treat the emblem as decorative when visible `SHD.build` text names the product.
+Give an emblem-only home link the accessible name `SHD.build home`. Preserve
+the approved colors and full opacity in focus, disabled, and compact contexts;
+use text or control styling to communicate state instead of fading the mark.
+The Field Manual White core and Signal Orange arcs must remain distinct from
+their background at every delivered size.
+
 ## Colors
 
 The palette uses Operations Black, Terminal Graphite, Field Manual White, rare