docs: keep sidecar; Node 24 is an engines floor not a Bun replacement

Do not clobber the sidecar product line. engines.node >=24 is for Node-side
tooling; native Node does not load extensionless TypeScript source.

Author: TheGreatAxios

README.md

@@ -5,11 +5,14 @@ Memory for [Interchange](https://github.com/corbitsdev) hubs: **add**, **search*
 
 Mount it on the hub. Routes land under `/api/tenants/:tenantId/memory/*`, so
 the hub’s existing `createResolveTenant` middleware supplies principal + tenant
-— same as workflows, assets, and agents. Workflow agents install the package’s
-`defineTool` factories; ingestion modules call the same routes or the in-process
-plane. That’s the product.
-
-Requires Bun 1.2+ and Node 24+.
+— same as workflows, assets, and agents. Deployed agents carry the sidecar
+bundle and call the run-scoped routes under `/api/workflow-memory/*`;
+ingestion modules call the tenant routes or the in-process plane. That’s the
+product.
+
+Requires Bun 1.2+. `engines.node` is `>=24` as a floor for Node-side tooling
+(typecheck, pack); native Node does not load this package's extensionless
+TypeScript source.
 
 ## Install