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Unify command output line splitting across executors

Remote.sshRun and Dry.Run dropped every empty line and kept a trailing
CR, while Local.Run kept blank lines and trimmed the CR, so the same
stdout produced different slices depending on the implementation. All
three now share splitOutputLines, moved from local.go to executor.go.

Echo skips empty lines when joining the output for the report, so the
reported detail stays as it was for remote commands and no longer shows
empty segments for local ones. Whitespace-only lines are still reported.