Add SSH host-filter fan-out via dynamic task mapping#179
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An SSHTask whose ssh_hook is a HostQuery(kind="filter") now fans out across every matching host using Airflow dynamic task mapping, rendered and instantiated as Operator.partial(...).expand(remote_host=[...]). - One mapped task with per-host, independently-retryable instances - A single base hook supplies shared credentials; only remote_host is mapped, so matching hosts must share username/password/key_file (validated, otherwise a clear error is raised) - Opt-in: the default kind="select" single-host behaviour is unchanged - Add render/instantiate tests and multi-host balancer fixtures
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An SSHTask whose ssh_hook is a HostQuery(kind="filter") now fans out across every matching host using Airflow dynamic task mapping, rendered and instantiated as Operator.partial(...).expand(remote_host=[...]).