RouteDNS ran `cloudflared tunnel route dns` without --overwrite-dns and
swallowed the resulting "record already exists" error as success. When a
hostname already had a CNAME from an earlier tunnel that was deleted and
recreated, the record stayed bound to the dead tunnel: the setup reported
the hostname "routed" while it kept returning Cloudflare error 1033 (the
tunnel it pointed at has no connector).
Pass --overwrite-dns so the record is repointed at the tunnel just created,
making the route idempotent and correct on every re-run, and drop the
now-unnecessary "already exists" swallow. INTEGRATION-ONLY (ExecRunner
shells out to the real cloudflared binary).
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