Add exponential backoff retry mechanism to handle ECONNREFUSED errors when the
server isn't ready yet during daemon startup. This includes:
- New errorUtils module with error classification helpers
- withRetry function in time.ts supporting configurable exponential backoff
- Machine registration retry with sensible defaults (60 attempts, 1-30s delays)
- Error refactoring to consolidate extractErrorInfo utility
close#35
weishu