Serve the 2026-07-28 protocol over stdio: decide the era from the opening request #3598

Job	Run time
checks / docs	1m 2s
checks / test (3.10, locked, ubuntu-latest)	1m 22s
checks / test (3.10, locked, windows-latest)	1m 59s
checks / readme-snippets	13s
checks / pre-commit	49s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.11, lowest-direct, windows-latest)	1m 57s
checks / test (3.11, locked, windows-latest)	1m 49s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 24s
checks / test (3.12, locked, windows-latest)	1m 54s
checks / test (3.12, lowest-direct, windows-latest)	2m 2s
checks / test (3.11, locked, ubuntu-latest)	1m 25s
checks / test (3.13, locked, windows-latest)	1m 46s
checks / test (3.13, locked, ubuntu-latest)	1m 13s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.13, lowest-direct, windows-latest)	1m 55s
checks / test (3.14, locked, ubuntu-latest)	1m 21s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 31s
checks / test (3.12, locked, ubuntu-latest)	1m 32s
checks / test (3.14, locked, windows-latest)	1m 59s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.10, lowest-direct, windows-latest)	2m 9s
checks / test (3.14, lowest-direct, windows-latest)	1m 44s
all-green	3s
	35m 3s

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