v1.2.1

Fixed

• Release and smoke-install CI: bind the local install-test server to 127.0.0.1 so macOS runners (which resolve localhost to IPv6 first) no longer hang and fail the installer download (#124)
• Linux package build produces a valid Debian version for non-numeric smoke builds (smoke -> 0.0.0~smoke), fixing the dpkg-deb "version number does not start with digit" failure (#124)
• Release workflow no longer pushes directly to protected main: the Homebrew formula bump now lands via an auto-mergeable PR and nightly bench results are committed to a dedicated bench-results branch (#124, #125)