diff --git a/package.json b/package.json
index 8d5f086b..ca0e555a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "data-monorepo",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "private": true,
   "engines": {
     "node": ">=24"
diff --git a/packages/data-ai/.claude-plugin/plugin.json b/packages/data-ai/.claude-plugin/plugin.json
index 62a20bf4..6943da17 100644
--- a/packages/data-ai/.claude-plugin/plugin.json
+++ b/packages/data-ai/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "adobe-data-ai",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Architecture skills for @adobe/data — data-oriented modelling, archetype iteration, hot-path performance, and related conventions.",
   "author": {
     "name": "Adobe"
diff --git a/packages/data-ai/package.json b/packages/data-ai/package.json
index 72a50bcc..5f45b3da 100644
--- a/packages/data-ai/package.json
+++ b/packages/data-ai/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adobe/data-ai",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Cross-agent architecture skills for @adobe/data — installable as a Claude Code plugin or copied into any Agent-Skills-compatible agent (Cursor, Codex).",
   "type": "module",
   "private": false,
diff --git a/packages/data-gpu/package.json b/packages/data-gpu/package.json
index 0364e43b..e637c416 100644
--- a/packages/data-gpu/package.json
+++ b/packages/data-gpu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adobe/data-gpu",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Adobe data WebGPU plugins and types for graphics and compute",
   "type": "module",
   "private": false,
diff --git a/packages/data-gpu/src/graphics/animation/animation-track/interpolate.test.ts b/packages/data-gpu/src/graphics/animation/animation-track/interpolate.test.ts
new file mode 100644
index 00000000..0f1b91e5
--- /dev/null
+++ b/packages/data-gpu/src/graphics/animation/animation-track/interpolate.test.ts
@@ -0,0 +1,27 @@
+// © 2026 Adobe. MIT License. See /LICENSE for details.
+
+import { describe, it, expect } from "vitest";
+import { Quat } from "@adobe/data/math";
+import type { Schema } from "@adobe/data/schema";
+import { interpolate } from "./interpolate.js";
+
+describe("interpolate", () => {
+    it("resolves a schema's named interpolator via the registry (Quat linear ⇒ slerp)", () => {
+        const a: Quat = [0, 0, 0, 1];                                 // identity
+        const b: Quat = [0, Math.SQRT1_2, 0, Math.SQRT1_2];          // 90° about Y
+        // Must equal slerp exactly — proving it dispatched to the registered
+        // "slerp" function, not the componentwise-lerp fallback (which would
+        // produce a different, non-normalized result).
+        expect(interpolate(Quat.schema, "linear", a, b, 0.5)).toEqual(Quat.slerp(a, b, 0.5));
+    });
+
+    it("falls back to componentwise lerp when no interpolator is named", () => {
+        const schema: Schema = { type: "array", items: { type: "number" } };
+        expect(interpolate(schema, "linear", [0, 10], [10, 20], 0.5)).toEqual([5, 15]);
+    });
+
+    it("throws on a named interpolator that isn't registered", () => {
+        const schema: Schema = { type: "number", interpolators: { linear: "nope" } };
+        expect(() => interpolate(schema, "linear", 0, 1, 0.5)).toThrow(/unknown interpolator "nope"/);
+    });
+});
diff --git a/packages/data-gpu/src/graphics/animation/animation-track/interpolate.ts b/packages/data-gpu/src/graphics/animation/animation-track/interpolate.ts
index 8fdbcbc1..a6a57166 100644
--- a/packages/data-gpu/src/graphics/animation/animation-track/interpolate.ts
+++ b/packages/data-gpu/src/graphics/animation/animation-track/interpolate.ts
@@ -3,11 +3,13 @@
 import type { Schema } from "@adobe/data/schema";
 import type { InterpolationMode } from "../interpolation-mode/interpolation-mode.js";
 import { componentwiseLerp } from "./componentwise-lerp.js";
+import { interpolatorRegistry } from "./interpolator-registry.js";
 
 /**
  * Dispatches to a schema-declared interpolator if present, otherwise falls
  * back to a sensible default: `step` returns `next`, `linear` walks the schema
- * and lerps numeric leaves. `cubicSpline` requires a schema override.
+ * and lerps numeric leaves. `cubicSpline` requires a schema override. A schema
+ * names its interpolator (pure JSON); the name is resolved via the registry.
  */
 export function interpolate(
     schema: Schema,
@@ -16,8 +18,12 @@ export function interpolate(
     next: any,
     t: number,
 ): any {
-    const custom = schema.interpolators?.[mode];
-    if (custom) return custom(prev, next, t);
+    const name = schema.interpolators?.[mode];
+    if (name !== undefined) {
+        const custom = interpolatorRegistry[name];
+        if (!custom) throw new Error(`interpolate: unknown interpolator "${name}" for mode "${mode}"`);
+        return custom(prev, next, t);
+    }
     if (mode === "step") return prev;
     if (mode === "linear") return componentwiseLerp(schema, prev, next, t);
     throw new Error(`interpolate: schema type "${schema.type}" has no "${mode}" interpolator`);
diff --git a/packages/data-gpu/src/graphics/animation/animation-track/interpolator-registry.ts b/packages/data-gpu/src/graphics/animation/animation-track/interpolator-registry.ts
new file mode 100644
index 00000000..b47c14dc
--- /dev/null
+++ b/packages/data-gpu/src/graphics/animation/animation-track/interpolator-registry.ts
@@ -0,0 +1,14 @@
+// © 2026 Adobe. MIT License. See /LICENSE for details.
+
+import { Quat } from "@adobe/data/math";
+
+type Interpolator = (prev: any, next: any, t: number) => any;
+
+/**
+ * Resolves the serializable interpolator NAMES a pure-JSON `Schema` may declare
+ * (e.g. `Quat.schema`'s `interpolators.linear = "slerp"`) to their functions.
+ * The schema names the interpolator; the animation system owns the behavior.
+ */
+export const interpolatorRegistry: Readonly<Record<string, Interpolator>> = {
+    slerp: Quat.slerp,
+};
diff --git a/packages/data-lit/package.json b/packages/data-lit/package.json
index c9c522e1..f0c3f1cd 100644
--- a/packages/data-lit/package.json
+++ b/packages/data-lit/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adobe/data-lit",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Adobe data Lit bindings - hooks, elements, decorators",
   "type": "module",
   "private": false,
diff --git a/packages/data-persistence/package.json b/packages/data-persistence/package.json
index 81e196cb..6d5d3bf1 100644
--- a/packages/data-persistence/package.json
+++ b/packages/data-persistence/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@adobe/data-persistence",
-    "version": "0.10.8",
+    "version": "0.10.9",
     "description": "Worker-based incremental persistence layer for @adobe/data ECS over OPFS (browser) and node:fs (server).",
     "type": "module",
     "sideEffects": false,
diff --git a/packages/data-react/package.json b/packages/data-react/package.json
index 2ae887a1..d7f7a1a5 100644
--- a/packages/data-react/package.json
+++ b/packages/data-react/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adobe/data-react",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Adobe data React bindings — hooks and context for ECS database",
   "type": "module",
   "private": false,
diff --git a/packages/data-solid/package.json b/packages/data-solid/package.json
index 0587e437..2239b05a 100644
--- a/packages/data-solid/package.json
+++ b/packages/data-solid/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adobe/data-solid",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Adobe data SolidJS bindings — context and provider for ECS database",
   "type": "module",
   "private": false,
diff --git a/packages/data-sync/package.json b/packages/data-sync/package.json
index e1d2e770..dd30c769 100644
--- a/packages/data-sync/package.json
+++ b/packages/data-sync/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@adobe/data-sync",
-    "version": "0.10.8",
+    "version": "0.10.9",
     "description": "Multi-user real-time synchronisation for @adobe/data ECS — server, client, and in-process loopback.",
     "type": "module",
     "sideEffects": false,
diff --git a/packages/data-testing/package.json b/packages/data-testing/package.json
index 781198c6..7431781b 100644
--- a/packages/data-testing/package.json
+++ b/packages/data-testing/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adobe/data-testing",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Conformance-testing utilities (Match + Conformance runners) for @adobe/data ECS features",
   "type": "module",
   "sideEffects": false,
diff --git a/packages/data/package.json b/packages/data/package.json
index acb781b3..62cf0719 100644
--- a/packages/data/package.json
+++ b/packages/data/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@adobe/data",
-  "version": "0.10.8",
+  "version": "0.10.9",
   "description": "Adobe data oriented programming library",
   "type": "module",
   "sideEffects": false,
diff --git a/packages/data/src/math/quat/schema.ts b/packages/data/src/math/quat/schema.ts
index 2c95c3ba..3c732269 100644
--- a/packages/data/src/math/quat/schema.ts
+++ b/packages/data/src/math/quat/schema.ts
@@ -2,7 +2,6 @@
 
 import { F32 } from "../f32/index.js";
 import { Schema } from "../../schema/index.js";
-import { slerp } from "./slerp.js";
 
 export const schema = {
     type: 'array',
@@ -10,8 +9,10 @@ export const schema = {
     minItems: 4,
     maxItems: 4,
     default: [0, 0, 0, 1], // identity quaternion
+    // "slerp" (spherical linear interpolation) — the animation system resolves
+    // this name to Quat.slerp so quaternion tracks interpolate on the 4-sphere.
     interpolators: {
-        linear: slerp,
+        linear: "slerp",
     },
 } as const satisfies Schema;
 
diff --git a/packages/data/src/schema/schema.ts b/packages/data/src/schema/schema.ts
index 0c9240f9..ba7b89ab 100644
--- a/packages/data/src/schema/schema.ts
+++ b/packages/data/src/schema/schema.ts
@@ -110,13 +110,15 @@ export interface Schema {
   const?: any;
   enum?: readonly any[];
   layout?: Layout; // Memory layout for typed buffers (std140 or packed)
-  // Per-type interpolation overrides used by the animation system. Schemas omit
-  // this when the componentwise lerp / step default is correct (Vec3, scalar, …).
-  // Quat declares { linear: slerp } so quaternion tracks are interpolated on the
-  // 4-sphere instead of component-wise.
+  // Per-type interpolation overrides for the animation system, as serializable
+  // NAMES (not functions — a Schema is pure JSON data). Each name is resolved to
+  // an interpolator by the consuming animation system's registry (see
+  // `@adobe/data-gpu` animation-track). Schemas omit this when the componentwise
+  // lerp / step default is correct (Vec3, scalar, …); `Quat` declares
+  // `{ linear: "slerp" }` so quaternion tracks interpolate on the 4-sphere.
   interpolators?: {
-    readonly linear?: (prev: any, next: any, t: number) => any;
-    readonly step?: (prev: any, next: any, t: number) => any;
-    readonly cubicSpline?: (prev: any, next: any, t: number) => any;
+    readonly linear?: string;
+    readonly step?: string;
+    readonly cubicSpline?: string;
   };
 }
diff --git a/packages/data/src/service/async-data-service/create-lazy.md b/packages/data/src/service/async-data-service/create-lazy.md
index 35f7091c..bb570073 100644
--- a/packages/data/src/service/async-data-service/create-lazy.md
+++ b/packages/data/src/service/async-data-service/create-lazy.md
@@ -2,7 +2,7 @@
 
 ## Overview
 
-`AsyncDataService.createLazy` provides a type-safe way to create lazy-loading wrapper factories for AsyncDataServices. The real service is only loaded when the first property is accessed. Wrapping is driven by the service's **sideloaded schema** — a `Schema` published beside the service (e.g. `MyService.schema`) rather than attached to instances.
+`AsyncDataService.createLazy` provides a type-safe way to create lazy-loading wrapper factories for AsyncDataServices. The real service is only loaded when the first property is accessed. Wrapping is driven by the service's **sideloaded schema** — a `Schema` authored beside the service (e.g. `MyService.schema`) and passed to `createLazy`. (Separately, a service may also expose that schema at runtime via the optional base-`Service` `schema` slot, typed `Observe<Schema>` so it can change as the interface evolves.)
 
 ## Import
 
diff --git a/packages/data/src/service/async-data-service/create-lazy.test.ts b/packages/data/src/service/async-data-service/create-lazy.test.ts
index 070f05de..0a0877fc 100644
--- a/packages/data/src/service/async-data-service/create-lazy.test.ts
+++ b/packages/data/src/service/async-data-service/create-lazy.test.ts
@@ -410,10 +410,14 @@ describe('createLazy', () => {
 
     const service = factory();
 
+    // The schema slot is Observe<Schema>; subscribing emits the constant synchronously.
+    let observed: unknown;
+    service.schema?.((s) => { observed = s; });
+
     assert({
       given: 'a lazy service is created',
-      should: 'expose the same schema without triggering a load',
-      actual: `${service.schema === schema},${loaded}`,
+      should: 'expose its schema as a constant observable without triggering a load',
+      actual: `${observed === schema},${loaded}`,
       expected: 'true,false'
     });
   });
diff --git a/packages/data/src/service/async-data-service/create-lazy.ts b/packages/data/src/service/async-data-service/create-lazy.ts
index 9b61332c..6279a2d7 100644
--- a/packages/data/src/service/async-data-service/create-lazy.ts
+++ b/packages/data/src/service/async-data-service/create-lazy.ts
@@ -174,10 +174,11 @@ export function createLazy<
     }
 
     // Build lazy service object. Expose the schema up front (before load) so the
-    // lazy instance is introspectable without triggering a load.
+    // lazy instance is introspectable without triggering a load. The base slot is
+    // `Observe<Schema>`, so publish the static contract as a constant observable.
     const lazyService: any = {
       serviceName: 'lazy-service',
-      schema,
+      schema: Observe.fromConstant(schema),
     };
 
     // Wrap each member based on the strategy derived from its schema
diff --git a/packages/data/src/service/service.ts b/packages/data/src/service/service.ts
index 0ef35e5d..acf1253f 100644
--- a/packages/data/src/service/service.ts
+++ b/packages/data/src/service/service.ts
@@ -1,6 +1,7 @@
 // © 2026 Adobe. MIT License. See /LICENSE for details.
 
 import type { Schema } from "../schema/index.js";
+import type { Observe } from "../observe/index.js";
 
 /**
  * A service is an object that provides functionality to an application.
@@ -16,13 +17,17 @@ import type { Schema } from "../schema/index.js";
  * A service's shape can be described by a `Schema` (an object schema whose
  * property schemas describe each member). The schema is authored beside the
  * service (e.g. `MyService.schema`) and validated with `IsValidWithCompleteSchema`;
- * a factory may also attach it to the instance via the optional `schema` slot for
- * runtime introspection. Both `serviceName` and `schema` are base-`Service`
- * metadata, so they are excluded from `AsyncDataService.IsValid` and reserved as
- * member names. See `async-data-service/is-valid-with-*-schema.ts`.
+ * a factory may also expose it at runtime via the optional `schema` slot for
+ * introspection. It is `Observe<Schema>` — observable — because a service's
+ * discoverable interface can change at runtime (e.g. once an iframe-projected
+ * service loads and reveals a different surface). Both `serviceName` and `schema`
+ * are base-`Service` metadata, so they are excluded from `AsyncDataService.IsValid`
+ * (which is why `schema` need not be `Data`) and reserved as member names.
+ * See `async-data-service/is-valid-with-*-schema.ts`.
  */
 export interface Service {
   readonly serviceName?: string;
-  /** Optional runtime copy of the service's schema (its authored contract). */
-  readonly schema?: Schema;
+  /** Optional observable of the service's schema (its authored contract), which
+   *  may change at runtime as the service's discoverable interface evolves. */
+  readonly schema?: Observe<Schema>;
 }