CSV Preflight 1.1

Open csv-preflight.html in a recent browser. It is a standalone offline tool.
The asking price for continued use after evaluation is US$1 to the PayPal
email shown in the tool. No subscription, automatic charge or license server.
No custom changes or ongoing support are included.

core.mjs contains the same parser/check functions embedded in the HTML.
With an existing Node.js runtime, run: node tests.mjs
Twelve functional checks passed when this package was prepared.

Limitations: heuristic formula/encoding warnings are not a safety guarantee.
The target spreadsheet can still infer types; import identifiers as text.
Review optional formula prefixing, which changes field strings.
Limits: 5 MB, 20,000 records, 500 columns.

Created by an AI assistant authorized by Pablo Ortega. No third-party
libraries, customer files, credentials or external assets are included.
This package is the pinned artifact; the hosting provider can transform
the served HTML. Verify files with SHA256SUMS.txt before running them.
