Add structured moderation assessments with revision history

docs/guides/moderation.md

@@ -139,6 +139,14 @@ reason for workflow changes. Close a case with one of these outcomes: **Resolved
 reason. Reopen a closed case when new evidence or an appeal needs review; earlier
 decisions remain in its history. Editing case details does not reopen a case.
 
+Use **Edit assessment** to keep a concise current summary, list the applicable
+rules, and record a finding for each concern: hate speech, harassment, threats,
+safeguarding, spam, cheating, or another concern. Each finding is **Substantiated**,
+**Inconclusive**, or **Unsubstantiated**, with a short rationale. Findings describe
+the evidence; the case's workflow status and final outcome remain separate.
+Every saved assessment retains its author, timestamp, and complete previous
+revision. Assessments can be revised after closure without reopening the case.
+
 Apply a ban or mute directly from an active case. The case fixes the target game
 and GUID and records the resulting restriction alongside the evidence. The same
 role, scope, and duration limits apply as elsewhere in Moderation. Applying a