The httpx client behind 'agnes query --remote' used the default 30s
timeout, killing every BigQuery SELECT that took longer than half a
minute — i.e. most non-trivial remote queries.
cli/client.py now exposes QUERY_TIMEOUT_S (default 300s, override via
AGNES_QUERY_TIMEOUT) and propagates a kw-only 'timeout' through
api_get/post/delete/patch. _query_remote passes QUERY_TIMEOUT_S so only
the long-running /api/query path gets the bump; every other CLI call
keeps the 30s default.
Server-side has no read deadline on /api/query, so the client cap was
the sole bottleneck.
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