…o 0.15.1Bug Fix:- **QoS 1 Publish Reliability**: Fixed error handling in QoS 1 message processing- **Resource Leak Prevention**: Ensure inflight messages are properly cleaned up on errors- **Ordering Guarantee**: Maintain proper ACK sequencing even after publish failuresKey Changes:1. **Error Handling Improvement**:   - Added proper error mapping to clean up inflight messages on publish failure   - Separated publish operation from ACK sending for better error isolation   - Ensured inflight removal happens before propagating errors2. **Version Bump**:   - Bumped workspace version from 0.15.0 to 0.15.1   - Updated all plugin dependencies to 0.15.1   - Maintained version synchronization across all componentsTechnical Details:- The fix addresses a potential resource leak where inflight messages wouldn't be cleaned up if `self.publish()` failed- Now properly removes the inflight entry before returning the error- Maintains the ACK sending operation separately to ensure proper protocol sequencingThis patch release (0.15.1) focuses on improving reliability and preventing resource leaks in QoS 1 message handling.

- Replaced `map_err` with `inspect_err` for cleaner error side effects- Maintains same functionality: removes inflight entry on publish failure- More idiomatic Rust error handling pattern- Keeps original error unchanged while performing cleanup

chore: bump version to 0.15.1 and improve shutdown process