Adolanium (comment 5983756525 §4), corroborated by andrexibiza (F13 receiver
class) and helix4u: _process_handles() keyed handles by variable spelling for
the whole module, so an async `proc` in one function made a correctly bounded
sync `proc.communicate(timeout=1)` in another function fail HX006 (and a
`def stop(proc)` parameter inherited whatever `proc` meant elsewhere).
A plain-name handle now belongs to the scope that binds it: the innermost
scope binding the name decides (class bodies are invisible to methods,
closures see their enclosing function), and within it the latest binding
before the call, so reassignment (Popen -> asyncio process -> None)
re-classifies the receiver. Parameters and other bindings clear it. Attribute
handles (`self._proc`) stay shared by the methods of their class, keyed by
that class rather than by spelling across the module.
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