EPD Scan Vault

Walks every vault document source attached to the workspace (/workspace/local/sources), classifies each PDF as an EPD, Product Carbon Footprint, LCA report or other, matches it to the normalized products by name or material category, records its A1-A3 boundary and validity, and writes epd-vault-index.json. Read-only. No sources attached is success, not an error. This is the verifying step for vault documents: it is the first to read their text, so downstream steps act on its verdicts rather than re-checking them.