Io — issue codes (i18nprune.io.*)
read_failed
Severity: error
When: A command that supports --json could not complete because of filesystem or JSON parse failure while building the normal payload (same class of problems as unreadable locale files, but outside validate’s dedicated code). JSON parse failures are reported through the shared core reader and include the file path plus best-effort line / column when the runtime exposes a parse offset.
Who: missing, sync, quality, review, cleanup, generate, report, etc., when their run* paths catch I/O errors. path may mirror errno’s path when available.
What to do: Read message, fix the file path or JSON content, then re-run. Prefer --config / a single config file in CI. See CLI prompts.