[v2] Dispatcher/ServerRunner receive-path swap — replaces BaseSession #2528

Job	Run time
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, locked, windows-latest)	1m 20s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.10, lowest-direct, windows-latest)	1m 19s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.12, locked, windows-latest)	1m 30s
checks / readme-snippets	15s
checks / test (3.13, lowest-direct, windows-latest)	1m 50s
checks / test (3.11, lowest-direct, windows-latest)	1m 14s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	1m 28s
checks / test (3.14, locked, windows-latest)	2m 9s
checks / test (3.14, locked, ubuntu-latest)	2m 0s
checks / pre-commit	32s
checks / test (3.13, locked, windows-latest)	1m 28s
checks / test (3.14, lowest-direct, windows-latest)	1m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, ubuntu-latest)	49s
checks / test (3.12, lowest-direct, windows-latest)	1m 16s
all-green	6s
	25m 30s

Provide feedback