Add Pro access guideline

Author: jemgillam

website/src/pages/pricing.mdx

@@ -567,7 +567,7 @@ offer ends; saving you a minimum of $1300 over the regular price of $100 /month.
 
 ### Graphile Worker is OSS under the MIT license
 
-Graphile Worker is sufficient for many peoples needs; it's the only version that
+Graphile Worker is sufficient for many peoples needs; it’s the only version that
 existed for the first 5 years of the project and many people are running it with
 great success in production. No features in Graphile Worker have been removed or
 obscured, and it continues to be developed and maintained, supported by
@@ -595,6 +595,25 @@ code hosted on GitHub. Worker Pro can be installed using an authenticated
 `authToken`, see the [Worker Pro documentation](/docs/pro#getting-access) for
 the full details.
 
+### Repository access policy
+
+To keep pricing fair and sustainable, access to the Graphile Sponsors repository
+is intended for:
+
+- A limited number of individual users within your organization (e.g. evaluators
+  or team leads)
+- Any necessary service or automation accounts
+
+As a guideline, access should be limited to those who actively need it and users
+should be reasonably attributable to the sponsoring organization. Requests to
+add users should be sent with their GitHub usernames and, where the user is not
+publicly linked to the sponsoring profile, a brief explanation of their role or
+relationship to the sponsor.
+
+We reserve the right to review and limit access where usage falls outside the
+spirit of this model. If you require broader access across a team or
+organization, please contact us to discuss options.
+
 ### Does Worker Pro come with direct support?
 
 Access to Worker Pro grants access to its repository, where users can file