[codex] Add revenue dispute evidence guard

[newmattock]

/claim #20

Summary

• add a self-contained revenue dispute and failed-payment evidence guard
• detect disputed, short-paid, and failed payments across Stripe, PayPal, and institutional invoice rails
• emit entitlement hold/limit decisions, evidence packets, prioritized finance actions, and deterministic audit digests
• include synthetic revenue data, requirement mapping, SVG/GIF demo artifacts, a short MP4 demo video, CLI demo, and Node tests

Distinctness

This slice focuses on post-billing payment risk: chargebacks, short-payments, failed payments, evidence packet readiness, dispute deadlines, and entitlement holds. It avoids duplicating existing billing, metering, entitlement, procurement, licensing, tax, margin, renewal, and revenue-recognition submissions.

Demo

• revenue-dispute-evidence-guard/docs/demo.mp4
• revenue-dispute-evidence-guard/docs/demo.gif
• revenue-dispute-evidence-guard/docs/demo.svg
• cd revenue-dispute-evidence-guard && npm run demo

Validation

• npm run check
• npm test
• npm run demo
• git diff --check
• verified docs/demo.mp4 is ISO Media MP4
• verified docs/demo.gif renders as 960x540 with 3 frames