v1.5.0-beta.2: fix: eliminate critical security vulnerabilities and stability issues

Security Fixes:
- Remove dangerous credential truncation that could bypass authentication
- Eliminate all unwrap() calls that could cause process crashes
- Fix potential memory leaks in event channel handling

Stability Improvements:
- Replace panic-prone error handling with proper error propagation
- Fix blocking disconnect operation that could hang applications
- Improve producer creation error handling
- Add graceful degradation for event system failures

Code Quality:
- Apply clippy suggestions for better Rust idioms
- Remove unused imports and clean up code
- Improve error messages and logging

Breaking Changes: None - all fixes maintain API compatibility

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

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