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## Summary Fixes to `buzz auth desktop pair` and relay selection: - **`pair` skips desktops that aren't running.** A desktop that exited without removing its advertisement no longer counts toward "several Buzz desktops are running". It uses the same running test as `probe`, where only a transport failure means not running. - **`--relay` is global**, so `buzz auth desktop pair --relay …` works and the flag shows in subcommand help. - **A bare host means `https://`** for `--relay` and `BUZZ_RELAY_URL`. An explicit `http://`, `ws://` or `wss://` stays as typed. - **`pair` with no relay sends `[client]`.** The desktop pairs for its active community and returns the bound relays, which the CLI stores. An older desktop answers `invalid_request`, which the CLI reports as "this Buzz can't pick a community; pass --relay". - **`docs/local-credential-provider.md`**: covers the one-parameter `pair`, `unavailable` when no community is active, the older-provider fallback, skipping stale advertisements, and a lapsed sign-in keeping the pairing instead of revoking it. - The existing `concurrent_pair_and_unpair…` test now fails after 60s instead of hanging when the held pair request never reaches the mock desktop. - The CLI tests that run the real `lsof` same-user check now take turns. A nextest test group, `desktop-same-user-check`, serializes the whole `desktop_provider::` module for the pre-push hook. Most of its tests reach the check, and the few that don't run serially too. A test-only lock around the check does the same in `cargo test`. Waiting for a turn doesn't count against the request timeout. The check and its 5s limit are unchanged. `list_tells_a_stale_advertisement_from_a_rejection` keeps the in-cap `retry_after` of 30 and times from the desktop's first answer, so waiting for a turn isn't counted. The desktop half is block/buzz-app#3386. ## Testing - New tests: `pair_skips_a_desktop_that_is_not_running`, `an_older_desktop_asks_for_a_relay`, `relay_flag_is_global_and_a_bare_host_means_https`, plus updated relay-selection cases. - `cargo test -p buzz-cli --locked -- --test-threads=4` passes: 689 tests, both with default threads and with `--test-threads=4`, and under the pre-push hook's nextest run. --------- Signed-off-by: Will Pfleger <wpfleger@block.xyz> Co-authored-by: Hayt <211b96e6a2b7f45fd4047988976c7bbbeeda0c15f3ae7b32eec20834b5a55118@buzz.block.builderlab.xyz>