veraPDF integration for PDF/UA validation

[taylorarndt]

Summary

Integrate veraPDF CLI as an optional validation backend for comprehensive, standards-grade PDF/UA conformance checking.

Why

The current PDF scanning uses XML-based heuristic rules. veraPDF is the industry-standard open-source PDF/UA validator and would provide authoritative conformance results for production audits.

Scope

• Optional dependency (current scanning continues to work without it)
• MCP tool wrapper for veraPDF CLI
• Result mapping to existing rule IDs and severity scoring
• Installation guide

Priority

Medium

[taylorarndt]

This is an interesting thought. Maybe.