Why (M1 follow-up; invariant 4, no trading): matching a departed module-level occurrence by
its line alone let `except Exception:` stand for any guard, so deleting
`try: import json / except Exception: pass` from one file paid for a new
`try: import yaml / except Exception: pass` in another (exit 0; red on the previous commit).
A module-level occurrence now moves only with its whole top-level statement unchanged
(found by indentation: a whole try/except block, or a one-line constant). Moving an unchanged
HX005 module constant to another file passes; a different constant still blocks.
Hits inside a unit matched across files keep line matching: only that unit's own departed
occurrences can pay.
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