refactor(gateway): remove user reputation feature entirely

Drop trust-score/infraction system: delete userReputationStore, remove call sites in fallback/batch processors, drop formatReputationAttrs, drop user_reputations table (migration 0016), delete trust-model test, update docs.

services/discord-gateway/src/shared/config/index.ts

@@ -222,7 +222,8 @@ export const configSchema = z
     AI_GLOSSARY_MAX_TERMS: z.coerce.number().int().min(1).max(20).default(6),
     // Per-user personal profile summaries (userProfileLearner). Disabled by
     // default: profiles bloat the analysis context and add LLM/DB cost for
-    // little moderation signal — only <user_reputation> history is injected.
+    // little moderation signal — user history context (last flagged messages)
+    // is injected via <user_history> instead of a numeric trust score.
     AI_USER_PROFILE_LEARNING_ENABLED: z
       .string()
       .optional()

services/discord-gateway/src/shared/database/schema.ts

@@ -337,32 +337,6 @@ export const pgUserProfilesTable = pgTable(
 
 export const userProfilesTable = pgUserProfilesTable;
 
-/**
- * User Reputations Table (PostgreSQL)
- * Tracks user trust score and infractions to provide context to AI.
- */
-export const pgUserReputationsTable = pgTable(
-  "user_reputations",
-  {
-    user_id: pgText("user_id").primaryKey(),
-    guild_id: pgText("guild_id").notNull(),
-    trust_score: pgInteger("trust_score").notNull().default(50),
-    clean_message_streak: pgInteger("clean_message_streak")
-      .notNull()
-      .default(0),
-    total_infractions: pgInteger("total_infractions").notNull().default(0),
-    last_infraction_at: pgBigint("last_infraction_at", { mode: "number" }),
-    created_at: pgBigint("created_at", { mode: "number" }).notNull(),
-    updated_at: pgBigint("updated_at", { mode: "number" }).notNull(),
-  },
-  (table) => ({
-    guildIdx: pgIndex("idx_user_reputations_guild_id").on(table.guild_id),
-    scoreIdx: pgIndex("idx_user_reputations_trust_score").on(table.trust_score),
-  }),
-);
-
-export const userReputationsTable = pgUserReputationsTable;
-
 /**
  * Channel Cultures Table (PostgreSQL)
  * Stores AI-generated summaries of channel norms and slang to inject as context.
@@ -592,10 +566,6 @@ export type AIAnalysisRunInsert = typeof aiAnalysisRunsTable.$inferInsert;
 export type UserProfile = typeof userProfilesTable.$inferSelect;
 export type UserProfileInsert = typeof userProfilesTable.$inferInsert;
 
-// User Reputations
-export type UserReputation = typeof userReputationsTable.$inferSelect;
-export type UserReputationInsert = typeof userReputationsTable.$inferInsert;
-
 // Channel Cultures
 export type ChannelCulture = typeof channelCulturesTable.$inferSelect;
 export type ChannelCultureInsert = typeof channelCulturesTable.$inferInsert;

services/discord-gateway/src/shared/database/schema/analytics.ts

@@ -2,26 +2,17 @@ import {
   pgAIAnalysisRunsTable,
   pgChannelCulturesTable,
   pgUserProfilesTable,
-  pgUserReputationsTable,
 } from "../../../shared/index.js";
 
 // Re-export shared tables
-export {
-  pgAIAnalysisRunsTable,
-  pgChannelCulturesTable,
-  pgUserProfilesTable,
-  pgUserReputationsTable,
-};
+export { pgAIAnalysisRunsTable, pgChannelCulturesTable, pgUserProfilesTable };
 export const aiAnalysisRunsTable = pgAIAnalysisRunsTable;
 export const channelCulturesTable = pgChannelCulturesTable;
 export const userProfilesTable = pgUserProfilesTable;
-export const userReputationsTable = pgUserReputationsTable;
 
 // Types
 export type AIAnalysisRun = typeof aiAnalysisRunsTable.$inferSelect;
 export type AIAnalysisRunInsert = typeof aiAnalysisRunsTable.$inferInsert;
-export type UserReputation = typeof userReputationsTable.$inferSelect;
-export type UserReputationInsert = typeof userReputationsTable.$inferInsert;
 export type ChannelCulture = typeof channelCulturesTable.$inferSelect;
 export type ChannelCultureInsert = typeof channelCulturesTable.$inferInsert;
 export type UserProfile = typeof userProfilesTable.$inferSelect;