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Parallel `make test` targets each auto-ran `compose-up`, which rendered into a fixed Corefile.tmp; the first replace() stole the file from the others and surfaced as "envsubst did not produce an output file". mkstemp per process plus a flock'd re-check in the test wrapper so only one target brings the stack up. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>