feat: Phase 2+3 — effects, streams, springs, search + dashboard
Phase 2 — Effect System & Streams:
- Algebraic effects (perform/handle/handleAsync) for composable,
testable side-effects with swappable handlers
- Stream engine with map, filter, debounce, throttle, distinct,
scan, flatMap, merge, fromEvent, fromSignal, fromPromise
- Search-with-autocomplete example: debounce + flatMap + effects
Phase 3 — Spring Physics:
- RK4 integrator with fixed substep and sleep-when-idle scheduler
- Springs are signals — anything that reads spring.value auto-updates
- Dashboard example: spring-animated sidebar, staggered card entrance,
draggable spring ball with configurable stiffness/damping/mass
Runtime evolution: v0.1 (signals) → v0.2 (+ effects + streams) → v0.3 (+ springs)
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