Integrate secret parameter into peer classes

- Add secret field to PeerOptions interface
- Pass secret when creating offers in CreatingOfferState
- Pass secret when answering offers in AnsweringState
- Bump version to 0.7.7

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/peer/answering-state.ts

@@ -28,7 +28,7 @@ export class AnsweringState extends PeerState {
 
       // Send answer to server BEFORE setLocalDescription
       // This registers us as the answerer so ICE candidates will be accepted
-      await this.peer.offersApi.answer(offerId, answer.sdp!);
+      await this.peer.offersApi.answer(offerId, answer.sdp!, options.secret);
 
       // Enable trickle ICE - set up handler before ICE gathering starts
       this.setupIceCandidateHandler();

src/peer/creating-offer-state.ts

@@ -36,7 +36,8 @@ export class CreatingOfferState extends PeerState {
       const offers = await this.peer.offersApi.create([{
         sdp: offer.sdp!,
         topics: options.topics,
-        ttl: options.ttl || 300000
+        ttl: options.ttl || 300000,
+        secret: options.secret
       }]);
 
       const offerId = offers[0].id;

src/peer/types.ts

@@ -22,6 +22,8 @@ export interface PeerOptions {
   topics: string[];
   /** How long the offer should live (milliseconds) */
   ttl?: number;
+  /** Optional secret to protect the offer (max 128 characters) */
+  secret?: string;
   /** Whether to create a data channel automatically (for offerer) */
   createDataChannel?: boolean;
   /** Label for the automatically created data channel */