JoaoMarcos44 (inline py_rules.py:442, review 5408210901; reproduced by
andrexibiza): after `proc.kill()` only an expression or plain-assignment
`proc.wait()` was recognised as reaped, so `return proc.wait()` and
`rc: int = proc.wait()` were flagged while the identical `rc = proc.wait()`
passed, and refactoring an accepted assignment into a return gained a blocker.
Return and AnnAssign values now count as the adjacent wait. The negative
controls stay flagged: no preceding kill, a different killed receiver,
communicate() after kill, and asyncio Process.wait() after kill; an explicit
finite timeout is still accepted. The assignment->return refactor is covered
through the real comparison path.
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