v0.1: contract legal overhaul + Grav site + e-sign integration

- Real dispute-resolution/governing-law/venue section replaces the
  unenforceable 'auto resolved in our favor' clause; jury waiver
  rewritten with carve-outs
- New sections: definitions, liability cap, confidentiality, IP,
  force majeure, assignment, notices, termination/renewal, e-sign
- SLA/SLO semantics fixed (SLA=contractual min, SLO=non-binding
  target); payment currency/invoicing terms added
- Introduction now mustache-templated ({{PARTY2}} bug fixed)
- SUMMARY.md structure fixed (case mismatch, empty heading, dupes)
- RenderBook.sh build-only; new RenderSite.sh renders Grav pages
  (site/) incl. DocuSeal e-sign page via APISIX

Ticket: https://projects.knownelement.com/issues/924

KNEL-Contract-Template-Variables.env

@@ -2,13 +2,23 @@
 export PARTY1="Known Element Enterprises LLC"
 export PARTY2="TSYS Group Component"
 
+export GOVERNING_STATE="Texas"
+export VENUE_COUNTY="Collin County"
+
 export CONTRACT_LENGTH="99 years"
+export RENEWAL_TERM="one-year"
 
 export PAYMENT_AMOUNT="100.00"
-export PAYMENT_FREQUENCY="Monthly"
+export PAYMENT_CURRENCY="USD"
+export PAYMENT_FREQUENCY="month"
+export INVOICE_CADENCE="monthly"
+export PAYMENT_DUE_DAYS="30"
 
 export SERVICES_SLA="95%"
 export SERVICES_SLO="99%"
 
 export SLA_PENALTY="none"
-export SLO_PENALTY="none"
+export SLO_PENALTY="none"
+
+export ESIGN_API_URL="https://apigw.knownelement.com/contract-sign/api/v1/submissions"
+export ESIGN_TEMPLATE_ID=""