v0.1.8 — restore macOS 14 installer compatibility

Rebuilds the macOS installer on the macOS 26 runner with a macOS 14 deployment target and pinned macOS 14-compatible bundled libraries. The plugin and all three bundled dylibs were inspected in the CI-built package and report minimum macOS 14.0; the package version is 0.1.8. Windows and Linux binaries are unchanged from v0.1.7 because plugin source did not change. The package is ad-hoc signed, not Developer ID notarized. Actual execution on macOS 14 has not been tested.