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Per Codex: source-controlled strings (name, feed_url, last_error, review_reason) could be read as formulas by spreadsheet apps if they start with = + - @. Add _csv_cell — prefixes such strings with an apostrophe; numbers pass through untouched (no risk, and avoids mangling negatives). Routed every exported cell through it. Test: a =HYPERLINK(...) source name is escaped, never bare. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>