Branches that still free the fixed ports 3110, 3111, 5180 and 4321 keep
running on the shared host (main, the nightly run, other open PRs) until
they carry the per-runner ports. A job of ours on the runner without a
numeric suffix used exactly those defaults, so such a neighbour could
still kill it, and its own port freeing could kill the neighbour. The
unsuffixed runner now starts at offset 100, so no job from this workflow
touches the defaults in either direction.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MRtGG9ARfqqhma3t85Ro2u
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