Re-vendor 2026-07-28 schema and absorb spec #2907 error-code renumber #2787

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	41s
checks / test (3.10, locked, ubuntu-latest)	59s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.12, lowest-direct, windows-latest)	1m 25s
checks / test (3.12, locked, windows-latest)	1m 24s
checks / test (3.11, locked, ubuntu-latest)	50s
checks / test (3.10, locked, windows-latest)	1m 30s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.11, lowest-direct, windows-latest)	1m 50s
checks / test (3.12, locked, ubuntu-latest)	1m 2s
checks / test (3.10, lowest-direct, windows-latest)	1m 30s
checks / test (3.13, lowest-direct, windows-latest)	1m 42s
checks / test (3.13, locked, windows-latest)	1m 27s
checks / test (3.14, locked, ubuntu-latest)	1m 57s
checks / test (3.14, lowest-direct, ubuntu-latest)	57s
checks / test (3.14, lowest-direct, windows-latest)	1m 22s
checks / test (3.14, locked, windows-latest)	2m 13s
checks / test (3.11, locked, windows-latest)	1m 24s
checks / test (3.13, locked, ubuntu-latest)	53s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 0s
all-green	3s
	27m 27s

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