Improve moderation controls and term management

docs/CONTENT_MODERATION.md

@@ -55,6 +55,19 @@ ISAC Site Controls stores the site-wide policy:
 - category review and priority thresholds;
 - allowed and banned local terms.
 
+The term registry accepts single rules and batch imports. Batch imports use one
+term or phrase per line, accept commas and semicolons as separators, infer word
+or phrase matching, and add no more than 250 unique rules. Word rules match
+exact forms: `kill` does not match `kills`, `killed`, or `killing`. The import
+skips duplicates, records each created rule in the ISAC audit log, and leaves
+the batch editor open for the next list. The registry provides server-side
+search and displays 25 rules per page by default.
+
+Each Site Controls category has its own save action. A save validates and
+updates only that category, increments the moderation policy version when
+applicable, and records a specific ISAC audit event with before and after
+evidence. Unsaved changes in other categories remain local drafts.
+
 Site Controls requires `site.settings.manage`. Community Oversight handles text
 decisions through the existing comment and profile permissions. Avatar
 Oversight handles custom images through `avatars.review`.