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Replaces requirements_dev.txt with a [dependency-groups] dev table in pyproject.toml, and updates CI to install via `pip install --group dev`.
Bumps the CI matrix to 3.12, 3.13, 3.14. NEP 29 dropped 3.11 on 2026-04-24, so 3.10 and 3.11 are no longer in scope.
Python 3.14 changed the multiprocessing default from fork to forkserver on Linux, which pickles the target process. The Frontend's service instances carry pipes and transport state that aren't pickleable, so the previous reliance on fork semantics no longer works out of the box. Force the fork start method at module load to preserve existing behaviour. fork is deprecated upstream and will eventually need a real refactor.
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