feat(pairing): add PairingStore interface for persistence injection

src/channels/pairing.ts

@@ -14,7 +14,7 @@ interface PendingCode {
   label?: string;
 }
 
-interface ApprovedSender {
+export interface ApprovedSender {
   channel: string;
   senderId: string;
   approvedAt: number;
@@ -22,6 +22,12 @@ interface ApprovedSender {
   codeUsed: string;
 }
 
+export interface PairingStore {
+  loadApproved(): ApprovedSender[];
+  saveApproved(sender: ApprovedSender): void;
+  removeApproved(channel: string, senderId: string): void;
+}
+
 /**
  * Manages DM pairing codes for authenticating unknown senders.
  *
@@ -35,9 +41,17 @@ export class PairingManager {
   private config: PairingConfig;
   private pendingCodes: Map<string, PendingCode> = new Map();
   private approvedSenders: Map<string, ApprovedSender> = new Map();
+  private store?: PairingStore;
 
-  constructor(config: PairingConfig) {
+  constructor(config: PairingConfig, store?: PairingStore) {
     this.config = config;
+    this.store = store;
+    if (store) {
+      for (const sender of store.loadApproved()) {
+        const key = `${sender.channel}:${sender.senderId}`;
+        this.approvedSenders.set(key, sender);
+      }
+    }
   }
 
   /** Generate a new pairing code. Returns the code string. */
@@ -77,12 +91,14 @@ export class PairingManager {
 
     // Code is valid — approve the sender
     const key = `${channel}:${senderId}`;
-    this.approvedSenders.set(key, {
+    const approved: ApprovedSender = {
       channel,
       senderId,
       approvedAt: Date.now(),
       codeUsed: normalizedCode,
-    });
+    };
+    this.approvedSenders.set(key, approved);
+    this.store?.saveApproved(approved);
 
     // Remove the used code
     this.pendingCodes.delete(normalizedCode);
@@ -98,7 +114,11 @@ export class PairingManager {
   /** Revoke approval for a sender. Returns true if the sender was found and removed. */
   revokeApproval(channel: string, senderId: string): boolean {
     const key = `${channel}:${senderId}`;
-    return this.approvedSenders.delete(key);
+    const deleted = this.approvedSenders.delete(key);
+    if (deleted) {
+      this.store?.removeApproved(channel, senderId);
+    }
+    return deleted;
   }
 
   /** List all currently approved senders. */