Client-side 2026-07-28 support: .discover()/.adopt() + Client(mode=); request-metadata green #2957

Job	Run time
checks / pre-commit	48s
checks / readme-snippets	14s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.11, lowest-direct, windows-latest)	1m 34s
checks / test (3.12, locked, windows-latest)	1m 33s
checks / test (3.10, locked, windows-latest)	1m 33s
checks / test (3.12, lowest-direct, windows-latest)	1m 29s
checks / test (3.11, locked, windows-latest)	1m 45s
checks / test (3.12, locked, ubuntu-latest)	1m 4s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.10, locked, ubuntu-latest)	57s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.11, locked, ubuntu-latest)	1m 1s
checks / test (3.13, locked, windows-latest)	1m 31s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.13, lowest-direct, windows-latest)	1m 37s
checks / test (3.14, lowest-direct, windows-latest)	1m 36s
checks / test (3.14, lowest-direct, ubuntu-latest)	57s
checks / test (3.13, locked, ubuntu-latest)	53s
checks / test (3.14, locked, windows-latest)	2m 25s
checks / test (3.14, locked, ubuntu-latest)	1m 56s
checks / test (3.10, lowest-direct, windows-latest)	1m 26s
all-green	4s
	28m 46s

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