Client-side 2026-07-28 support: .discover()/.adopt() + Client(mode=); request-metadata green #2970

Job	Run time
checks / pre-commit	40s
checks / test (3.13, lowest-direct, windows-latest)	1m 40s
checks / test (3.14, locked, ubuntu-latest)	1m 55s
checks / test (3.12, locked, windows-latest)	1m 33s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.10, locked, ubuntu-latest)	1m 2s
checks / test (3.11, locked, windows-latest)	1m 30s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.10, lowest-direct, windows-latest)	1m 38s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.10, locked, windows-latest)	1m 31s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.13, locked, windows-latest)	1m 36s
checks / test (3.11, locked, ubuntu-latest)	56s
checks / readme-snippets	11s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.12, locked, ubuntu-latest)	1m 8s
checks / test (3.12, lowest-direct, windows-latest)	1m 57s
checks / test (3.14, locked, windows-latest)	4m 58s
checks / test (3.13, locked, ubuntu-latest)	59s
checks / test (3.14, lowest-direct, windows-latest)	1m 33s
checks / test (3.11, lowest-direct, windows-latest)	1m 40s
all-green	4s
	31m 49s

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