Strip client to minimal skeleton with ConnectionManager

Removed all complex implementations and kept only the essentials:
- Removed durable/ directory (DurableConnection, DurableChannel, etc.)
- Removed peer/ directory (entire state machine)
- Removed service-pool.ts, offer-pool.ts, rondevu.ts
- Removed auth.ts, offers.ts, usernames.ts, event-emitter.ts
- Added empty ConnectionManager class as starting point

The client now contains just:
- src/connection-manager.ts - Empty class skeleton
- src/index.ts - Simple export

This provides a clean slate to rebuild the client with a simpler
architecture focused on core WebRTC connection management.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/index.ts

@@ -1,36 +1,6 @@
 /**
  * @xtr-dev/rondevu-client
- * WebRTC peer signaling and discovery client with durable connections
+ * WebRTC peer signaling client
  */
 
-// Export main client class
-export { Rondevu } from './rondevu.js';
-export type { RondevuOptions } from './rondevu.js';
-
-// Export authentication
-export { RondevuAuth } from './auth.js';
-export type { Credentials, FetchFunction } from './auth.js';
-
-// Export username API
-export { RondevuUsername } from './usernames.js';
-export type { UsernameClaimResult, UsernameCheckResult } from './usernames.js';
-
-// Export durable connection APIs
-export { DurableConnection } from './durable/connection.js';
-export { DurableChannel } from './durable/channel.js';
-export { DurableService } from './durable/service.js';
-
-// Export durable connection types
-export type {
-  DurableConnectionState,
-  DurableChannelState,
-  DurableConnectionConfig,
-  DurableChannelConfig,
-  DurableServiceConfig,
-  QueuedMessage,
-  DurableConnectionEvents,
-  DurableChannelEvents,
-  DurableServiceEvents,
-  ConnectionInfo,
-  ServiceInfo
-} from './durable/types.js';
+export { ConnectionManager } from './connection-manager.js';