motion-foundations

# Motion Foundations

The base layer of the motion system. Defines every value, constraint, and
rule that downstream skills (`motion-patterns`, `motion-advanced`) inherit.
Load this skill before any animation work begins.

## When to Activate

- Starting any animated component from scratch
- Setting up tokens, spring presets, or easing values
- Implementing `prefers-reduced-motion` support
- Debugging hydration mismatches from animation initial states
- Evaluating whether an animation should exist at all

## Outputs

This skill produces:

- A shared `motionTokens` object (duration, easing, distance, scale)
- A shared `springs` preset map (5 named configs)
- A `shouldAnimate()` gate used by all components
- Accessibility-compliant animation defaults via `useReducedMotion`
- SSR-safe initial states with zero hydration warnings

## Principles

Motion must do at least one of the following or it must be removed:

- Guide attention
- Communicate state
- Preserve spatial continuity

Responsiveness always outranks smoothness. A 60 fps animation that causes
input delay is worse than no animation.

## Rules

These are non-negotiable. They apply to every component in the system.
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