V3.5.1 - ExChek Enterprise Plugin

Official PDF memorandum (Option 2, ExChek Enterprise). Classification now offers two deliverables at report time: the existing free local Word document (Option 1, default — unchanged, fully offline), or the official branded 21-page ExChek classification-memorandum PDF rendered by the ExChek API at a flat $1 per report (Option 2, prepaid credits, no subscription).

• exchek-classify: Flow step 6 asks the one-question deliverable choice; new Official PDF memorandum section and references/pdf-rendering.md cover key setup, the variable contract (GET https://api.exchek.us/pdf/classification/contract / get_classification_pdf_contract), REST and MCP render calls, and error handling. Rendering is stateless (render-and-discard); the CUI/Classified gate explicitly excludes Option 2 — air-gapped memos stay on Option 1.
• Plugin: new optional enterprise_api_key setting; when set, the bundled exchek-api MCP connection sends it as the Authorization header so create_classification_pdf works without any per-call key handling. Keys come from https://api.exchek.us/enterprise/checkout.
• exchek-orchestrator: routing note — the deliverable question belongs to the classify skill; the hub must not pre-empt it.