Fix macOS test failure due to symlink path resolution in RandomDirectoryContext

[Copilot]

The RandomDirectoryContext test failed on macOS because /var is symlinked to /private/var. TemporaryDirectory.name returns the symlink path while os.getcwd() resolves to the real path, causing the assertion to fail.

Changes

• RandomDirectoryContext.__enter__(): Return os.getcwd() instead of self.name to ensure consistent path resolution across platforms
• Spelling fixes: Corrected "mimick" → "mimic", "Does't" → "Doesn't", "identical the ones" → "identical to the ones"

Example

# Before (fails on macOS):
def __enter__(self):
    self.__prev_dir = os.getcwd()
    super().__enter__()
    os.chdir(self.name)
    return self.name  # /var/folders/... (symlink)

# After (works on all platforms):
def __enter__(self):
    self.__prev_dir = os.getcwd()
    super().__enter__()
    os.chdir(self.name)
    return os.getcwd()  # /private/var/folders/... (resolved)

Since we've already changed to the temporary directory, os.getcwd() returns the resolved real path, eliminating platform-specific symlink inconsistencies.

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[bittner]

Integrated manually in original PR.