Add sponsor escrow readiness guard

[Jorel97]

/claim #18

Summary

• add a self-contained Sponsor Escrow Readiness Guard for the Scientific Bounty System
• validate synthetic challenge funding packets for escrow evidence, underfunding, stale/expiring escrow proof, unsupported currencies, missing release authorization, payout schedule mismatch, and incomplete payout routing
• generate reviewer-ready JSON, Markdown, SVG, GIF, and MP4 demo artifacts

Why this slice

This focuses on sponsor-side prize funding readiness before solver submissions open. It is distinct from existing #18 slices for intake/rubric readiness, scoring/arbitration, appeals, communication parity, accessibility/localization, onboarding parity, debrief feedback, withdrawal reimbursement, payout routing, and solver eligibility.

Validation

• C:\Users\Juanr\Documents\Codex\2026-05-27\goal-generame-al-menos-200-usd\tools\node\node.exe test.js
• C:\Users\Juanr\Documents\Codex\2026-05-27\goal-generame-al-menos-200-usd\tools\node\node.exe demo.js
• FFMPEG=... python demo_video.py
• git diff --check

Demo video

• sponsor-escrow-readiness-guard/reports/demo.mp4
• sponsor-escrow-readiness-guard/reports/demo.gif

Safety

Synthetic data only. No credentials, private challenge data, payment processors, wallets, live escrow providers, production payout systems, or external APIs.

AI-assisted with OpenAI Codex; I reviewed the implementation, tests, generated artifacts, and validation output before submitting.