fix: import on Python 3.8 (typing.* runtime aliases)#18
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- convert two module-level type aliases (ObserveTargets/ReporterMethods) from PEP 585 tuple[...] to typing.Tuple; the RHS is evaluated at import - import Callable from typing where it builds Handler / ContextHandler aliases at runtime (collections.abc generics are 3.9+)
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Two module-level type aliases used PEP 585
tuple[...]and three usedcollections.abc.Callable[...], all evaluated at import time and rejected by Python 3.8. Switch those runtime positions to thetypingaliases. Lint/format/mypy clean; 183 pass on 3.10; all modules import on a 3.8 interpreter.