fix(acpmux): forward result-line option through stable task start
A background-task option added in #33347 reached the task spec without being forwarded through the stable-start helper, so acpmux failed to compile with an undefined result_line. Forward the option from ordinary background starts and explicitly keep it off for native workflow machine tasks.
Validation at d746e624a89b1059cca122b7f9ab8f9718d56e7e: fleet run 41678018220 passed formatting, 3 focused library tests, 13 background-task integration tests and strict acpmux library clippy. The existing integration tests cover output, completion notices and task lifetime; compilation is the regression oracle for the missing argument.
The automatic clippy job’s remaining failure is the existing panic ratchet. Its compiler JSON artifact (13251567529, job 126063559512) has no deny-lint diagnostic in either changed file, and none on this repair’s added lines. Strict library clippy passed in the focused run.
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