feat: add EaseText component

[RamboWasReal]

Summary

• Add EaseText component — wraps EaseView + Text for native transform/opacity animations on text
• interpolateColor prop for smooth JS-side color transitions (opt-in, requestAnimationFrame)
• style.color for instant color changes (zero JS cost, default)
• useColorTransition hook handles color interpolation with easing, delay, and spring approximation
• All standard TextProps pass through (numberOfLines, ellipsizeMode, selectable, onPress, etc.)
• TextAnimateProps derived from AnimateProps (minus borderRadius/backgroundColor)
• 4 example demos: Text Color, Floating Label Input, Text Enter, Text Props
• Updated AGENTS.md with EaseText architecture docs
• Updated migration skill (SKILL.md) with EaseText patterns and classification

API

// Native transforms + smooth color
<EaseText
  interpolateColor={focused ? '#000' : '#999'}
  animate={{ translateY: focused ? -12 : 0, scale: focused ? 0.8 : 1 }}
  transition={{
    color: { type: 'timing', duration: 150 },
    transform: { type: 'spring', damping: 12, stiffness: 250 },
  }}
  transformOrigin={{ x: 0, y: 0.5 }}
  style={{ fontSize: 15 }}
  numberOfLines={1}
>
  {label}
</EaseText>

// Instant color (zero JS cost)
<EaseText
  animate={{ translateY: -12, scale: 0.8 }}
  transition={{ type: 'spring', damping: 12 }}
  style={{ color: focused ? '#000' : '#999', fontSize: 15 }}
>
  {label}
</EaseText>

Test plan

• 58 tests pass (51 EaseView + 7 EaseText)
• TypeScript: 0 errors
• ESLint: 0 errors
• Prettier + clang-format: clean
• Lefthook pre-commit hooks pass
• Visual verification on iOS simulator (Text Color, Floating Label, Text Enter, Text Props demos)
• Visual verification on Android emulator

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