Add subscription renewal notice guard

[charlie12520]

/claim #20

Summary:

• Adds a distinct subscription-renewal-notice-guard/ revenue-infrastructure slice for issue Revenue Infrastructure #20.
• Evaluates upcoming subscription, lab, and institutional renewals before invoice generation or auto-renewal.
• Checks notice-window timing, price/seat/usage disclosures, auto-renewal consent, cancellation link readiness, institutional PO approval, trial-to-paid notice coverage, and customer remediation actions.
• Emits deterministic JSON, Markdown, SVG, and MP4 review artifacts from synthetic data only.

Acceptance criteria reviewed:

• Issue Revenue Infrastructure #20 asks for modular revenue infrastructure covering subscription billing, billing cycles, trials/coupons, institutional plans, and usage-aligned growth.
• Algora requires /attempt #20, /claim #20, and a short demo video. /attempt #20 was posted before implementation, this body includes /claim #20, and reports/demo.mp4 is included.
• No CONTRIBUTING.md exists in this repository; the issue body and Algora instructions were used as the governing guidelines.

Validation:

• cd subscription-renewal-notice-guard && npm run check -> passed
• cd subscription-renewal-notice-guard && npm test -> subscription-renewal-notice-guard tests passed
• cd subscription-renewal-notice-guard && npm run demo -> generated JSON/Markdown/SVG artifacts; status hold_renewals, blockers 8, warnings 2
• cd subscription-renewal-notice-guard && npm run demo:video -> generated reports/demo.mp4
• Demo video metadata check -> 144 frames, 24fps, 1280x720, 1,226,315 bytes
• git diff --check and git diff --cached --check -> passed before commit

Safety:

• Synthetic sample data only.
• No credentials, private customer data, payment processor calls, bank/ACH/wallet actions, Stripe, PayPal, ERP, SSO, SCIM, or live billing systems are used.
• Existing open PRs were checked for obvious duplicate renewal-notice scope before submission; nearby work appears adjacent but distinct.

[charlie12520]

Follow-up quality pass pushed in d44a4d2:

• wired the configurable seat-change disclosure tolerance into the evaluator
• added coverage for stale terms-version consent and the seat-disclosure tolerance path
• added REQUIREMENT_MAP.md so reviewers can map the narrow renewal-notice slice to the revenue-infrastructure request

Revalidated after the follow-up:

• npm run check -> passed
• npm test -> subscription-renewal-notice-guard tests passed
• npm run demo -> regenerated JSON/Markdown/SVG artifacts with the same deterministic digest
• npm run demo:video -> regenerated reports/demo.mp4
• video metadata -> 144 frames, 24fps, 1280x720, 1,226,315 bytes
• git diff --check and git diff --cached --check -> passed before commit