Use persistent shares

By default, share tokens are ephemeral — they disappear when the process exits. For production use, create persistent shares that survive restarts and keep a stable token.

Create a persistent share by running this once to reserve a named token:
```
zrok2 create share my-gateway
```
Share names must be 3–32 characters, lowercase alphanumeric and hyphens ([a-z0-9-]). If you omit the name, zrok generates a random token.

Reference the token in your config:

mcp-gateway — set share_token at the top level:

share_token: "my-gateway"

aggregator:
  name: "my-dev-tools"
  version: "1.0.0"

mcp-bridge — pass --share-token:

mcp-bridge --share-token my-bridge mcp-filesystem ~/Documents

When you no longer need the share, delete it:
```
zrok2 delete share my-gateway
```