[QvarcY]

Summary

Hardens the automatic comparison path without adding new workflow steps.

Changes

• gives mapping suggestions explicit key / comparison roles;
• refuses automatic key selection when multiple identifier candidates are too close;
• prevents automatic pairing of known semantic groups with conflicting meanings;
• expands parser regression coverage for TSV, escaped quotes, malformed quotes, corrupt UTF-8 markers, duplicate headers and empty files;
• adds normalization/percentage-tolerance tests;
• adds CSV formula-injection regression coverage;
• updates roadmap state.

Scope

The default product flow remains unchanged:

2 files → automatic local comparison → Visual Diff

If automatic key selection is genuinely ambiguous, the app falls back to manual/expert mapping instead of guessing.