Client-side 2026-07-28 support: .discover()/.adopt() + Client(mode=); request-metadata green #2934

Job	Run time
checks / readme-snippets	11s
checks / test (3.14, lowest-direct, windows-latest)	1m 38s
checks / test (3.14, locked, windows-latest)	2m 19s
checks / pre-commit	39s
checks / test (3.14, lowest-direct, ubuntu-latest)	57s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.13, locked, windows-latest)	1m 20s
checks / test (3.14, locked, ubuntu-latest)	2m 2s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.13, locked, ubuntu-latest)	57s
checks / test (3.12, locked, windows-latest)	1m 55s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.11, locked, ubuntu-latest)	58s
checks / test (3.11, lowest-direct, windows-latest)	1m 43s
checks / test (3.11, locked, windows-latest)	1m 30s
checks / test (3.12, lowest-direct, windows-latest)	1m 47s
checks / test (3.13, lowest-direct, windows-latest)	1m 32s
checks / test (3.12, locked, ubuntu-latest)	1m 0s
checks / test (3.10, lowest-direct, windows-latest)	1m 37s
checks / test (3.10, locked, windows-latest)	1m 26s
checks / test (3.10, locked, ubuntu-latest)	1m 2s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 10s
all-green	3s
	28m 54s

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