Restore the cheap repo-wide guards the per-file triage classed as source reads
but that protect recurring bug classes (<2s total):
- subprocess env scrubbing near spawn sites (credential leakage)
- gateway UTF-8 encoding= on file I/O (Windows mojibake)
- no raw yaml.safe_load of config.yaml (lost ${ENV} expansion)
- CLI subprocess.run timeouts (hung CLI)
- no locked readers on the shared state.db connection (#99349 segfault)
- CI classifier outputs / live-comment watch list match real workflows
- relay imports no platform crypto (relay trust boundary)
- Desktop relay deliver budget mirrors the Python deadlines (#93911)
- no native title= on Desktop buttons (DESIGN.md rule)
Drop _BASELINE entries in check_os_marker_fakes.py for files that no longer
fake macOS (the checker fails on stale entries), and remove doc/comment
pointers to deleted tests.
4b17b284ce