Add Document Discrepancy Finder tool
8-step NDJSON-streaming pipeline that compares two Barnevernet documents: classifies each doc, extracts parties and timelines, cross-references both for contradictions/deletions/additions, retrieves corpus legal context, and synthesises a full discrepancy report with tabbed UI. New files: DiscrepancyAgent.php, api/discrepancy.php, discrepancy.php, discrepancy.js. Modified: FreeTier.php (cost=4), i18n.php (all 4 langs), tool-svgs.php (DC icon), tools.css (dc-* component styles). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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