Add ZeroLagHub brand direction note

Codex/Brand/BRAND_DIRECTION.md

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+# ZeroLagHub Brand Direction
+
+Status: approved direction for launch brand exploration.
+
+## Approved direction
+
+Use the Packet Ring direction as the ZeroLagHub brand mark.
+
+Core elements:
+
+- central `Z` lightning bolt as the energy source
+- speed streaks feeding into the mark
+- segmented orbital ring representing packet/data flow
+- 2-3 nodes positioned along the orbit in the direction of motion
+- no tagline baked into the logo lockup
+
+## Color spec
+
+Primary gradient:
+
+- `#00E5FF` electric cyan
+- `#1A6BFF` cobalt blue
+- direction: top-left to bottom-right
+
+The gradient should be reused in Portal UI brand tokens where practical so the logo and product accents feel aligned.
+
+## Variants required
+
+- primary icon + wordmark
+- horizontal navbar lockup
+- stacked marketing/hero lockup
+- icon-only variant
+- favicon variant using the `Z` only, no ring/nodes
+
+## Implementation notes
+
+Before final asset implementation:
+
+- verify ring stroke weight is consistent across icon-only, primary, and horizontal lockups
+- keep favicon legible at 16x16 and 32x32
+- export SVG master files, transparent PNGs, dark-background PNGs, and favicon package
+- keep tagline/descriptor in marketing copy only, not in the mark
+
+## Reference asset
+
+See `Codex/Brand/zerolaghub-brand-board.png` for the current generated concept board.