refactor(vine): overhaul IPC layer with enhanced error handling and structured logging

- Restructured Vine IPC module with detailed documentation aligning with Land's architecture goals
- Implemented granular error variants (VineError) for precise fault diagnosis in cross-process communication
- Added sidecar process monitoring with cleanup on exit to prevent resource leaks
- Introduced JSON line protocol validation and improved deserialization error context with raw samples
- Refactored reader/writer tasks with atomic request IDs and proper channel lifecycle management
- Enhanced request/response tracking using thread-safe maps and oneshot channels for RPC reliability
- Added structured logging integration for sidecar processes and Tauri event propagation
- Implemented cancellation propagation and timeout handling for Mountain-initiated requests
- Improved error recovery through lock poisoning handling and global state management

BREAKING CHANGE: Modified VineError variants and message serialization format requires sidecar protocol updates

Author: NikolaRHristov