Add challenge award transparency guard

challenge-award-transparency-guard/README.md

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+# Challenge Award Transparency Guard
+
+This module is a focused Scientific Bounty System slice for issue #18. It validates the post-arbitration, pre-publication step before a sponsor announces winners and releases award packets.
+
+The guard checks that:
+
+- final ranks have complete rubric-backed score breakdowns
+- reviewer conflict summaries are disclosed and unresolved conflicts hold publication
+- every solver team receives the result notice before public announcement
+- appeal windows close before payout release
+- award totals reconcile to cleared escrow
+- IP transfer is gated on payout readiness
+- private challenge announcements redact protected solver and artifact details
+
+It uses only Node.js built-ins and synthetic data.
+
+## Run
+
+```bash
+node challenge-award-transparency-guard/test.js
+node challenge-award-transparency-guard/demo.js
+```
+
+The demo writes reviewer artifacts to `challenge-award-transparency-guard/reports/`.

challenge-award-transparency-guard/demo.js

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+"use strict";
+
+const fs = require("node:fs");
+const path = require("node:path");
+const {
+  buildAwardTransparencyPacket,
+  buildMarkdownReport,
+  buildSvgSummary,
+} = require("./index");
+const { challenge } = require("./sample-data");
+
+const reportsDir = path.join(__dirname, "reports");
+fs.mkdirSync(reportsDir, { recursive: true });
+
+const packet = buildAwardTransparencyPacket(challenge);
+const markdown = buildMarkdownReport(packet);
+const svg = buildSvgSummary(packet);
+
+fs.writeFileSync(path.join(reportsDir, "award-transparency-packet.json"), `${JSON.stringify(packet, null, 2)}\n`);
+fs.writeFileSync(path.join(reportsDir, "award-transparency-report.md"), markdown);
+fs.writeFileSync(path.join(reportsDir, "summary.svg"), svg);
+
+console.log(`status=${packet.status}`);
+console.log(`blockers=${packet.blockers.length}`);
+console.log(`warnings=${packet.warnings.length}`);
+console.log(`auditDigest=${packet.auditDigest}`);
+console.log(`reports=${reportsDir}`);