[v2] Dispatcher/ServerRunner receive-path swap — replaces BaseSession #2584

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	33s
checks / test (3.10, lowest-direct, windows-latest)	1m 21s
checks / test (3.10, locked, windows-latest)	1m 23s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	1m 34s
checks / test (3.10, locked, ubuntu-latest)	1m 3s
checks / test (3.11, lowest-direct, windows-latest)	1m 38s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	1m 35s
checks / test (3.14, lowest-direct, windows-latest)	1m 12s
checks / test (3.13, locked, windows-latest)	1m 13s
checks / test (3.13, lowest-direct, windows-latest)	1m 45s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, locked, ubuntu-latest)	1m 49s
checks / test (3.12, locked, windows-latest)	1m 34s
checks / test (3.14, locked, windows-latest)	1m 55s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, ubuntu-latest)	51s
all-green	3s
	25m 45s

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