fix: align example config with reviewer merger separation

docs/wiki/Identity-and-Profiles.md

@@ -16,12 +16,21 @@ bind an authenticated Gitea identity to an allowed operation set.
 - **Allowed:** branch create/push, PR create, issue comment/create/close, repo commit, read.
 - **Forbidden:** PR approve, merge, request_changes.
 
-### Reviewer / merger
+### Reviewer
 
 - **Profile:** `prgs-reviewer`
 - **Typical identity:** `sysadmin`
-- **Allowed:** PR review/approve/merge/request_changes, issue comment, read.
-- **Forbidden:** branch push, PR create, repo commit.
+- **Allowed:** PR review/approve/request_changes, issue comment, read.
+- **Forbidden:** branch push, PR create, repo commit, PR merge.
+
+Review and merge are separate workflow roles. A reviewer approval is not merge authorization.
+
+### Merger
+
+- **Profile:** `prgs-merger`
+- **Typical identity:** `sysadmin`
+- **Allowed:** PR merge, issue comment, read.
+- **Forbidden:** branch push, PR create, repo commit, PR approve, PR review, PR request_changes.
 
 ## Configuration