humanspeak / svelte-motion / 28661197968

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feat(values): vanilla motion-value layer with unified rune sources (#432)

* test(setup): heal motion-dom's frame loop between fake-timer tests

Each test gets a fresh fake clock, so an rAF scheduled near the end of
the previous test (e.g. the frame.read that MotionValue
change-unsubscribers enqueue) was silently dropped with that clock —
but the batcher's runNextFrame flag stayed true, and frame.*() only
wakes the scheduler when the flag is false. Every frame-driven update
(computed values, springs, velocity) in the worker froze from then on;
this is what previously forced frame-dependent specs into isolated
files.

The rAF mock now keeps an exact pending-callback registry (added on
schedule, removed on invoke/cancel) and beforeEach invokes only
genuinely pending batches. An afterEach flush can't replace this — a
keepAlive batch reschedules itself, re-stranding the flag one layer
later.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(values): vanilla motion-value layer with unified rune/readable sources

Ports Motion's vanilla (component-free) value API to the package root
and unifies HOW every source kind — motion values, Svelte readables,
and reactive rune getters — flows into it and into the existing hooks.

New public surface:
- toMotionValue(source) — the rune bridge: MotionValue | Readable |
  (() => T) becomes an augmented MotionValue; getters run in an
  $effect.root so $state/$derived reads are tracked
- Vanilla factories motionValue / springValue / transformValue /
  mapValue: same augmented shape the hooks return (reactive .current,
  store .subscribe, real motion-dom identity), manual .destroy()
  lifecycle, usable outside components
- styleEffect / attrEffect / propEffect / svgEffect re-typed to accept
  augmented values (runtime passthrough — upstream's nominal
  MotionValue signature rejects the augmented TYPE only)
- Straight re-exports: frame, cancelFrame, frameData, spring,
  scrollInfo, MotionGlobalConfig, isMotionV... (continued)

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