Grogu will host multiple self-hosted runners simultaneously (planned: 3
runners). Each runner's job-start cleanup step previously killed ANY
xctest/swift-test/swift-driver — meaning sibling runners would nuke
each other's in-flight tests.
Real CI jobs complete in <10 min. Zombies from interactive Xcode use
are typically >hours old. A 1-hour age cutoff cleanly separates the
two populations.
awk filter: ps -o etime formats are `MM:SS` (<1h), `HH:MM:SS` (>=1h),
or `DD-HH:MM:SS` (days). Match the latter two by testing for `-` (days
prefix) or three `:`-separated groups.
Single-runner behavior unchanged. Validated against synthetic ps
output covering all three etime format cases.
Closes#188
james.maes