[v2] Dispatcher/ServerRunner receive-path swap — replaces BaseSession #2523

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	31s
checks / test (3.13, locked, windows-latest)	1m 33s
checks / test (3.13, lowest-direct, windows-latest)	1m 26s
checks / test (3.13, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, locked, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, windows-latest)	1m 24s
checks / test (3.10, lowest-direct, windows-latest)	1m 28s
checks / test (3.11, locked, windows-latest)	1m 21s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.14, locked, windows-latest)	2m 2s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.12, locked, windows-latest)	1m 17s
checks / test (3.14, lowest-direct, windows-latest)	1m 25s
checks / test (3.14, locked, ubuntu-latest)	1m 54s
checks / test (3.14, lowest-direct, ubuntu-latest)	48s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.10, locked, windows-latest)	1m 31s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, windows-latest)	1m 40s
checks / test (3.12, locked, ubuntu-latest)	55s
all-green	3s
	25m 44s

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