Harden CSV output for spreadsheet use - #36
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…codes Prefix CSV cells so spreadsheet applications treat exported values as data: '=' is always neutralized with a leading apostrophe; '+', '-', and '@' are neutralized only when the remainder is not purely alphanumeric, so benign identifiers such as '-00123' round-trip byte-for-byte. Applies to both data cells and headers. Also quotes values containing bare carriage returns.
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Summary
Hardens CSV output for spreadsheet use without converting numeric amounts to text.
=,+,-or@;Verification at
35a10e7e9907604e8d7796a5bb3bca873b0943d1npx vitest run test/lib/formatters.test.ts— 24 passed;npm run buildpassed;git diff --checkpassed.