Docs reference "Deny" action for change requests that doesn't exist

[gagantrivedi]

Summary

The change requests documentation states:

"Click Approve or Deny to record your decision."

However, there is no deny/reject functionality implemented anywhere in the product — neither in the frontend UI nor the backend API.

Current behaviour

• The frontend only renders an Approve button on change request pages (ChangeRequestDetailPage.tsx)
• The backend ChangeRequest model only has an approve() method — no deny() or reject()
• The ChangeRequestApproval model only tracks approved_at — no rejected/denied state
• Audit log constants only cover created, approved, committed, and deleted — no denial event

Expected behaviour

Either:

1. Fix the docs — remove the reference to "Deny" to match the actual product, or
2. Implement the feature — add deny/reject functionality to change requests

Steps to reproduce

1. Open the change requests documentation page
2. Note the mention of a "Deny" button
3. Create a change request and navigate to it as a reviewer
4. Observe there is no "Deny" option

Reported by

A customer in Slack raised this as they couldn't find the deny option described in the docs.