Class MorphWeights

Per-node morph-target weights (§54, §14, §17; RFC 0003 §1c) — the storage behind Mesh.morphTargetWeights, placed where the frozen §3.1 matrix lets @fourjs/animation bind it.

const weights = mesh.addComponent(new MorphWeights(2)); // two targets, at 0
weights.weights[0] = 0.5;                               // authored write

// §17's morph-weight track is a number track over one element (see
// @fourjs/animation's binding.ts — "weights.0" addresses weights[0]):
new AnimationTrack({ path: "weights.0", adapter: numberAdapter, ... });
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One per node (§6a). Holds authored state only: which morph target the weights mean is the geometry's business (the GPU morph path — additional vertex streams — is deferred by RFC 0003 §7 and staged in @fourjs/render's Mesh; this component, the binding form, and the render-item snapshot are the plumbing that ships now, so §14's morph-target animation is expressible and a document can carry the weights).

Weights are not clamped: §17's tracks legitimately overshoot (cubic anticipation), and morph weights outside 0…1 are meaningful (overdrive, negative targets). §85 checks finiteness at construction; in-place writes are the fast path and are not re-validated, exactly as geometry attributes are not.