fix: remove user history injection to prevent false positive moderation

- Removed getUserRecentInfractions usage in textBatchProcessor.ts and visionAnalyzer.ts
- Removed buildUserHistoryXml import and calls
- Messages are now evaluated standalone, not influenced by past violations in other channels
- Updated moderation prompts with clearer instructions about user_history usage
- Fixes issue where benign messages like 'tubuh manusia vs gravitasi' were incorrectly flagged due to carryover from previous drone weapons discussion

The user history context was causing the LLM to interpret unrelated current messages
as threats because it conflated them with past violations. Now each message is judged
on its own merit with only channel-specific context.

services/discord-gateway/src/modules/ai-moderation/visionAnalyzer.ts

@@ -66,7 +66,6 @@ import {
 } from "./mediaDownloader.js";
 import {
   buildReferenceXml,
-  buildUserHistoryXml,
   buildUserProfileRef,
   escapeXml,
   formatReputationAttrs,
@@ -90,10 +89,7 @@ import {
 import { buildTermGlossaryBlock } from "./termGlossary.js";
 import { extractUrlsFromText } from "./urlFetcher.js";
 import { getUserProfile } from "./userProfileStore.js";
-import {
-  getUserRecentInfractions,
-  initializeUserReputation,
-} from "./userReputationStore.js";
+import { initializeUserReputation } from "./userReputationStore.js";
 
 // ---------------------------------------------------------------------------
 // Types
@@ -459,27 +455,9 @@ export async function prepareMediaMessage(
     ? buildUserProfileRef(target.user_id)
     : "";
 
-  // Rich reputation — same shape as the text path: attrs + optional
-  // <user_history> with the last flagged messages for repeat offenders.
+  // Rich reputation — attrs only, no user history injection (per channel context preference)
   const repAttrs = formatReputationAttrs(rep);
-  let repXml = `<user_reputation ${repAttrs}/>`;
-  if (rep.total_infractions > 0) {
-    try {
-      const history = await getUserRecentInfractions(target.user_id, 2);
-      const historyXml = buildUserHistoryXml(
-        history.map((h) => ({
-          content: h.content ?? "",
-          severity: h.severity,
-          created_at: h.created_at,
-        })),
-      );
-      if (historyXml) {
-        repXml = `<user_reputation ${repAttrs}>\n${historyXml}\n</user_reputation>`;
-      }
-    } catch {
-      // history is a bonus — fall back to attrs-only reputation
-    }
-  }
+  const repXml = `<user_reputation ${repAttrs}/>`;
 
   const isBot = resolveIsBot(target);
   const isEdited = resolveIsEdited(target);