docs: say the docs cover the v2 beta and where v1 lives

apps/content/blume.config.ts

@@ -257,6 +257,10 @@ export default defineConfig({
     },
     mcp: {
       enabled: true,
+      // Sent to every connecting agent and reused as the server's ai-catalog
+      // description. Pretrained oRPC knowledge is mostly v1, so name the
+      // version and how to install it; update once v2 leaves beta.
+      instructions: 'Search and read the oRPC v2 documentation as Markdown. v2 is in beta and installs with the `@beta` tag (`npm install @orpc/server@beta @orpc/client@beta`); a plain install gets v1, whose APIs differ. If a project has `@orpc/*` 1.x installed, use the v1 docs at https://v1.orpc.dev, or https://orpc.dev/docs/migrations/from-v1 to upgrade.',
     },
     skills: '../../skills',
   },

apps/content/docs/getting-started.mdx

@@ -25,6 +25,8 @@ Install the server and client packages, plus a schema library for validating inp
 npm install @orpc/server@beta @orpc/client@beta zod
 ```
 
+These docs cover oRPC v2, currently in beta, so every install command in them uses the `@beta` tag. A plain `npm install @orpc/server` still installs v1, the current stable release, whose APIs differ from what these docs show. If your project is on v1, read the [v1 docs](https://v1.orpc.dev), or upgrade with [Migrating from oRPC v1](/docs/migrations/from-v1).
+
 ## Define a Router
 
 A procedure is a function that clients can call remotely. Build one with the `os` builder (short for oRPC server): optionally describe the input it accepts with a schema, then implement it with `.handler`. A router is a plain object that groups procedures and gives each one its calling path, like `planet.list`.

apps/content/docs/migrations/from-v1.mdx

@@ -18,7 +18,7 @@ Most of your code keeps working: many v1 names still compile through deprecated
 
 ## Update Packages
 
-Install the v2 versions of the packages you use:
+Install the v2 versions of the packages you use. Until v2 is stable, it is published under the `beta` npm tag, so installing without `@beta` gives you v1:
 
 ```sh v2
 npm install @orpc/server@beta @orpc/client@beta