feat: complete DM pairing codes with channel adapters, gateway handlers, and TUI command (Tier 4 feature 4)

src/channels/discord/adapter.ts

@@ -18,6 +18,7 @@ import type {
   ChannelStatus,
 } from '../types.js';
 import { splitMessage } from '../utils.js';
+import type { PairingManager } from '../pairing.js';
 
 /** Configuration for the Discord channel adapter. */
 export interface DiscordAdapterConfig {
@@ -28,6 +29,8 @@ export interface DiscordAdapterConfig {
   allowedChannelIds?: string[];
   /** Whether to require mention to respond in guild channels (default: true). DMs always respond. */
   requireMention?: boolean;
+  /** Optional pairing manager for DM pairing codes. */
+  pairingManager?: PairingManager;
 }
 
 /**
@@ -194,6 +197,20 @@ export class DiscordAdapter implements ChannelAdapter {
           return;
         }
       }
+    } else {
+      // DM pairing check — if pairing is enabled, require approval
+      const pm = this.config.pairingManager;
+      if (pm?.enabled && !pm.isApproved('discord', message.channelId)) {
+        const text = message.content.trim();
+        if (text && pm.validateCode('discord', message.channelId, text)) {
+          try {
+            if ('send' in message.channel) {
+              (message.channel as any).send('Pairing successful! You can now chat with Flynn.');
+            }
+          } catch { /* ignore send errors */ }
+        }
+        return;
+      }
     }
 
     // Send typing indicator (lasts 10 seconds, no need for interval)