Support additional evidence sources (ADRG, Reviewer's Guide)

[PawanRamaMali]

Summary

Currently R4SUB ingests evidence from Define-XML, Pinnacle 21, and custom sources. Regulatory submissions also include Analysis Data Reviewer's Guide (ADRG) and Study Data Reviewer's Guide (SDRG) which contain valuable readiness signals.

Tasks

• Research ADRG/SDRG structure (typically Word/PDF — may need text extraction)
• Design evidence extraction for: completeness of ADRG sections, presence of required tables, dataset documentation coverage
• Implement adrg_to_evidence() function (or determine if out of scope)
• Document supported vs. planned evidence sources in a comparison table

Context

This is exploratory — assess feasibility before committing to implementation. ADRG is less structured than Define-XML so extraction may be unreliable.