Add demo cases (HarvestLink v1/v2), subscription technical contract, portal + ops-portal HTML
- demo-case-harvestlink.md + v2: fictional staged proposals for product-marketing video (no PII) - CONTRACT.md: subscription model / contact form / receipt fixes technical contract (read-only analysis 2026-08-19) - portal/index.html + ops-portal/: customer portal + ops portal single-file builds - .gitignore: demo-creds*.txt excluded
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