Define the Connection interface that abstracts file operations, command
execution, and tmux management for both local and remote (SSH) contexts.
Includes:
- Connection interface with file, exec, and tmux operations
- FileInfo interface for remote stat results
- BasicFileInfo implementation with JSON serialization
- Error types for connection failures
This enables Gas Town to manage rigs on remote machines using the
same interface as local operations.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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