Fix #189: process worker fork-safety on macOS Tahoe#207

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Commits on May 28, 2026

Fix #189: don't fall back to fork() on macOS; redirect worker stderr
brentrager
committed
Pre-spawn process worker in cli.py to avoid the fds_to_keep race
brentrager
committed
Add unit tests for the macOS fallback guard and the cli pre-spawn helper
brentrager
committed