alexion
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provisionArmBin symlinks the shell arm's one allow-listed binary into a per-sitting bin directory, but a sitting's trials share that directory and re-provision it each trial, so the second trial's symlinkSync threw EEXIST. This crashed every shell arm (gitea-axi, tea, raw-api) at more than one trial per sitting; the gitea-mcp arm was unaffected because its shell is disabled and it symlinks nothing. Remove any existing link before re-creating it so provisioning is idempotent. Add a regression test that provisions the same bin directory twice and asserts it neither throws nor duplicates the link.