Add scientific bounty scope change guard

scientific-bounty-scope-change-guard/README.md

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+# Scientific Bounty Scope Change Guard
+
+Self-contained guard for SCIBASE issue #18, Scientific Bounty System.
+
+The module reviews sponsor-requested changes after a scientific bounty is launched. It blocks or escalates changes that would move the goalposts for solver teams: problem statements, deliverables, scoring rubrics, eligibility, prize schedules, NDA/data-room terms, and post-submission effective dates.
+
+## What It Checks
+
+- Material changes after launch are frozen unless they include sponsor, review, and audit evidence.
+- Submitted or in-progress solver work is grandfathered when scope changes after submissions begin.
+- Rubric weights still total 100 and changed scoring criteria have equal-notice evidence.
+- Eligibility and NDA/data-room changes cannot silently narrow access for active teams.
+- Prize schedule changes need finance/escrow evidence before scoring or payout.
+- Active solver teams receive equal notice, and material changes require consent or a deadline extension.
+
+## Files
+
+- `index.js` - evaluation engine and report formatters
+- `sample-data.js` - synthetic challenge scenarios
+- `test.js` - dependency-free tests using Node's built-in `assert`
+- `demo.js` - generates reviewer JSON, Markdown, and SVG reports
+- `render-video.js` - renders a short MP4 with `ffmpeg`, or an animated GIF fallback with ImageMagick
+- `reports/demo.mp4` / `reports/demo.gif` - reviewer demo artifact
+
+## Validation
+
+```bash
+node scientific-bounty-scope-change-guard/test.js
+node scientific-bounty-scope-change-guard/demo.js
+node scientific-bounty-scope-change-guard/render-video.js
+node --check scientific-bounty-scope-change-guard/index.js
+node --check scientific-bounty-scope-change-guard/sample-data.js
+node --check scientific-bounty-scope-change-guard/test.js
+node --check scientific-bounty-scope-change-guard/demo.js
+node --check scientific-bounty-scope-change-guard/render-video.js
+```

scientific-bounty-scope-change-guard/demo.js

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+const fs = require('fs');
+const path = require('path');
+const {
+  evaluateScopeChangeControl,
+  formatMarkdownReport,
+  formatSvgSummary
+} = require('./index');
+const { reviewInput } = require('./sample-data');
+
+const reportsDir = path.join(__dirname, 'reports');
+fs.mkdirSync(reportsDir, { recursive: true });
+
+const evaluation = evaluateScopeChangeControl(reviewInput);
+
+fs.writeFileSync(
+  path.join(reportsDir, 'scope-change-review.json'),
+  `${JSON.stringify(evaluation, null, 2)}\n`
+);
+fs.writeFileSync(path.join(reportsDir, 'scope-change-review.md'), formatMarkdownReport(evaluation));
+fs.writeFileSync(path.join(reportsDir, 'scope-change-review.svg'), formatSvgSummary(evaluation));
+
+console.log(`Generated reports in ${reportsDir}`);
+console.log(`Overall decision: ${evaluation.overallDecision}`);
+