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190a8d40c7
Replace the module-local `impureConfigMerger` with `lib.hm.generators.mkImpureConfigMerger`, keeping the JSON5 reader for settings that may contain comments. Behavior is preserved but two rough edges are fixed along the way: - A corrupted existing file now fails activation loudly instead of silently replacing the user's settings with the generated defaults. - An existing file keeps its permissions and symlink target instead of being replaced with a fresh mode-644 file. Add a test that runs the generated activation snippet with `$DRY_RUN` and `$VERBOSE` set, covering a dry-run that leaves existing settings untouched, a live merge on top of preexisting settings, verbose logging, silent quiet mode, permission preservation, and loud failure on a corrupted file. Assisted-by: Goose + GLM 5.3 Flash