Client-side 2026-07-28 support: .discover()/.adopt() + Client(mode=); request-metadata green #2942

Job	Run time
checks / readme-snippets	16s
checks / pre-commit	42s
checks / test (3.13, lowest-direct, windows-latest)	1m 31s
checks / test (3.11, locked, windows-latest)	1m 24s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.10, locked, ubuntu-latest)	1m 6s
checks / test (3.10, locked, windows-latest)	2m 5s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, locked, ubuntu-latest)	1m 57s
checks / test (3.10, lowest-direct, windows-latest)	1m 24s
checks / test (3.11, lowest-direct, windows-latest)	1m 31s
checks / test (3.14, locked, windows-latest)	2m 36s
checks / test (3.12, locked, windows-latest)	1m 34s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, windows-latest)	1m 48s
checks / test (3.13, locked, windows-latest)	1m 31s
checks / test (3.14, lowest-direct, ubuntu-latest)	58s
checks / test (3.14, lowest-direct, windows-latest)	1m 27s
checks / test (3.12, locked, ubuntu-latest)	1m 6s
checks / test (3.11, locked, ubuntu-latest)	57s
checks / test (3.13, locked, ubuntu-latest)	53s
all-green	5s
	28m 53s

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