docs(readme): correct npm install scope to @sf-agentscript (#34)

The Quick Start showed `pnpm add @agentscript/agentforce`, but
scripts/publish.mjs rewrites @agentscript/* to @sf-agentscript/*
at publish time, so the documented name is not on npm.

Updates the install command and import example to the published
scope and adds a one-line note linking to publish.mjs so future
readers understand the internal-vs-published name distinction.

Fixes #6

Author: dsorajisto

README.md

@@ -71,12 +71,14 @@ Opens the AgentScript playground at `http://localhost:27002`.
 
 ### Use as a Library
 
+> Packages are published to npm under the `@sf-agentscript/*` scope. The `@agentscript/*` names used elsewhere in this repo are the internal monorepo names — see [`scripts/publish.mjs`](scripts/publish.mjs).
+
 ```bash
-pnpm add @agentscript/agentforce
+pnpm add @sf-agentscript/agentforce
 ```
 
 ```typescript
-import { parse } from '@agentscript/agentforce';
+import { parse } from '@sf-agentscript/agentforce';
 
 const doc = parse(`
 system: