Rework execnet onto a trio-native core (sync facade, uv-provisioned workers, execnet.trio) - #422

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RonnyPfannschmidt:feat/trio-host-thread-io

Commits on Jul 23, 2026

test: add local ssh-connect harness + typing cleanups

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feat: run ssh gateways on the Trio path

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feat: ship the execnet wheel to ssh remotes for dev coordinators

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feat: add execnet-socketserver console command

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feat: run direct socket gateways on Trio with subprocess workers

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feat: migrate installvia to a GATEWAY_START_SOCKET protocol message

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refactor: remove the legacy socket coordinator code

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feat: run popen via-gateways on Trio via GATEWAY_START_POPEN

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