scripts/build-release.sh --upload now checks for an existing release
at the given tag before POSTing a new one. If found and --replace is
not set, errors out with a clear message.
This prevents the silent-overwrite problem: a user on v2.9.7 running
./scripts/upgrade.sh sees "no update available" when the v2.9.7
release's tarball contents have silently changed. Version tags should
be immutable once published.
--replace is still available for deliberate test-bench iteration
(DELETEs the existing release, then POSTs). Documented as destructive
in the --help output and DEV_WORKFLOW.md.
Bunker Admin
bunker-admin
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