Define visual and animation policy

ui/INVARIANTS.md

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+Visual intent:
+- Modern
+- Confident
+- Technical
+- High-signal
+
+Animation principles:
+- Animation communicates state or priority
+- Animation is purposeful, not decorative
+- Motion is fast and subtle
+
+Allowed animation:
+- Severity change (escalation/de-escalation)
+- New finding arrival
+- Hover affordances
+- Panel expand/collapse
+- Workflow transitions
+
+Restricted animation:
+- No looping animations
+- No animation that blocks interaction
+- No animation longer than 300ms
+- No animation on critical-path actions
+
+Graphics:
+- Data-driven visuals encouraged
+- Motion may reinforce severity or confidence
+- Visual emphasis must align with severity
+
+Rule:
+Flash is allowed when it clarifies meaning.