Adds the following methods to the Medium interface:
- Delete(path) - remove a file or empty directory
- DeleteAll(path) - recursively remove a file or directory
- Rename(old, new) - move/rename a file or directory
- List(path) - list directory entries (returns []fs.DirEntry)
- Stat(path) - get file information (returns fs.FileInfo)
- Exists(path) - check if path exists
- IsDir(path) - check if path is a directory
Implements these methods in both local.Medium (using os package)
and MockMedium (in-memory for testing). Includes FileInfo and
DirEntry types for mock implementations.
This enables migration of direct os.* calls to the Medium
abstraction for consistent path validation and testability.
Refs #101
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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