feat(connection): Add LocalConnection implementation (gt-f9x.8)
Implement LocalConnection that provides local file operations, command
execution, and tmux integration:
- File ops: ReadFile, WriteFile, MkdirAll, Remove, RemoveAll, Stat, Glob, Exists
- Command exec: Exec, ExecDir, ExecEnv
- Tmux: NewSession, KillSession, SendKeys, CapturePane, HasSession, ListSessions
Uses proper error wrapping with NotFoundError and PermissionError types.
Integrates with existing internal/tmux package for session management.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
b4ff6781b3