fix: lazy-import fcntl to prevent crash on Windows#167
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Fixes #166
Problem
linux.pyhasimport fcntlat module level. On Windows,fcntlis not available (Unix-only), so importingtrcc.adapters.system(which side-effect imports all OS modules) crashes withModuleNotFoundError: No module named 'fcntl'.Fix
Moved
import fcntlfrom module level to inside the methods that use it, so it's only imported on Linux where those methods are actually called.