Mark ADR 18 as adopted

[lesliecdubs]

Thanks to @hectahertz's work on completing the items in https://github.com/github/primer/issues/5089, we can now mark this ADR as adopted.

Changelog

Changed

Marks ADR 18 as adopted

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why - documentation change only

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Latest commit: 6d547f1

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Pull request overview

This PR updates the status of ADR 18 (Responsive Values) from "in progress" (🚧) to "adopted" (✅), following the completion of work tracked in issue #5089. This is a documentation-only change with no impact on code functionality.

Key changes:

• Marks ADR 18 as adopted in the status table